Adds support for clear cache

app/src/common/shared/org/mozilla/vrbrowser/browser/engine/SessionStack.java

@@ -24,6 +24,7 @@
 import org.mozilla.geckoview.GeckoSession;
 import org.mozilla.geckoview.GeckoSessionSettings;
 import org.mozilla.geckoview.MediaElement;
+import org.mozilla.geckoview.StorageController;
 import org.mozilla.geckoview.WebRequestError;
 import org.mozilla.vrbrowser.R;
 import org.mozilla.vrbrowser.browser.Media;
@@ -835,6 +836,27 @@ protected void setTrackingProtection(final boolean aEnabled) {
         recreateAllSessions();
     }
 
+    public void clearCache(final long clearFlags) {
+        if (mRuntime != null) {
+            // Per GeckoView Docs:
+            // Note: Any open session may re-accumulate previously cleared data.
+            // To ensure that no persistent data is left behind, you need to close all sessions prior to clearing data.
+            // https://mozilla.github.io/geckoview/javadoc/mozilla-central/org/mozilla/geckoview/StorageController.html#clearData-long-
+            for (Map.Entry<Integer, SessionState> entry : mSessions.entrySet()) {
+                SessionState state = entry.getValue();
+                if (state != null) {
+                    state.mSession.stop();
+                    state.mSession.close();
+                }
+            }
+
+            mRuntime.getStorageController().clearData(clearFlags).then(aVoid -> {
+                recreateAllSessions();
+                return null;
+            });
+        }
+    }
+
     // NavigationDelegate
 
     @Override

app/src/common/shared/org/mozilla/vrbrowser/browser/engine/SessionStore.java

@@ -235,6 +235,12 @@ public void setLocales(List<String> locales) {
         }
     }
 
+    public void clearCache(long clearFlags) {
+        for (Map.Entry<Integer, SessionStack> entry : mSessionStacks.entrySet()) {
+            entry.getValue().clearCache(clearFlags);
+        }
+    }
+
     // Permission Delegate
 
     @Override

app/src/common/shared/org/mozilla/vrbrowser/ui/widgets/settings/PrivacyOptionsView.java

@@ -19,6 +19,7 @@
 import androidx.databinding.DataBindingUtil;
 
 import org.mozilla.geckoview.GeckoSession;
+import org.mozilla.geckoview.StorageController;
 import org.mozilla.vrbrowser.R;
 import org.mozilla.vrbrowser.browser.SettingsStore;
 import org.mozilla.vrbrowser.browser.engine.SessionStore;
@@ -62,6 +63,17 @@ private void initialize(Context aContext) {
             exitWholeSettings();
         });
 
+        mBinding.clearCookiesSite.setOnClickListener(v -> {
+            SessionStore.get().clearCache(
+                    StorageController.ClearFlags.SITE_DATA |
+                            StorageController.ClearFlags.COOKIES |
+                            StorageController.ClearFlags.SITE_SETTINGS);
+        });
+
+        mBinding.clearWebContent.setOnClickListener(v -> {
+            SessionStore.get().clearCache(StorageController.ClearFlags.ALL_CACHES);
+        });
+
         TextView permissionsTitleText = findViewById(R.id.permissionsTitle);
         permissionsTitleText.setText(getContext().getString(R.string.security_options_permissions_title, getContext().getString(R.string.app_name)));
 

app/src/main/res/layout/options_developer.xml

@@ -13,11 +13,11 @@
             android:id="@+id/header_layout"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
+            app:helpVisibility="gone"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toTopOf="parent"
-            app:title="@string/settings_developer_options"
-            app:helpVisibility="gone" />
+            app:title="@string/settings_developer_options" />
 
         <ScrollView
             android:id="@+id/scrollbar"

app/src/main/res/layout/options_privacy.xml

@@ -44,6 +44,20 @@
                     app:buttonText="@string/developer_options_show"
                     app:description="@string/settings_privacy_policy" />
 
+                <org.mozilla.vrbrowser.ui.views.settings.ButtonSetting
+                    android:id="@+id/clearCookiesSite"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    app:buttonText="@string/developer_options_clear_cache"
+                    app:description="@string/developer_options_clear_cache_cookies_site_description" />
+
+                <org.mozilla.vrbrowser.ui.views.settings.ButtonSetting
+                    android:id="@+id/clearWebContent"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    app:buttonText="@string/developer_options_clear_cache"
+                    app:description="@string/developer_options_clear_cache_web_content_description" />
+
                 <org.mozilla.vrbrowser.ui.views.settings.SwitchSetting
                     android:id="@+id/drmContentPlaybackSwitch"
                     android:layout_width="match_parent"

app/src/main/res/values/strings.xml

@@ -290,6 +290,17 @@
     <!-- The string labels an On/Off switch in the developer options dialog and is used to toggle enabling Servo. -->
     <string name="developer_options_servo">Enable Servo</string>
 
+    <!-- The string labels the description text for the clear cookies and site data button in the
+         privacy options dialog. -->
+    <string name="developer_options_clear_cache_cookies_site_description">Cookies &amp; Site Data</string>
+
+    <!-- The string labels the description text for the clear cached web content button in the
+         privacy options dialog. -->
+    <string name="developer_options_clear_cache_web_content_description">Cached Web Content</string>
+
+    <!-- The string labels the button text for the clear cache buttons in the privacy options dialog. -->
+    <string name="developer_options_clear_cache">Clear Data</string>
+
     <!-- This string is used to label a numerical-entry field where the user may set a new value to
          use for the display density. -->
     <string name="developer_options_display_density">Display Density:</string>