Support fullscreen for non-video elements in the WebView.

android_webview/java/src/org/chromium/android_webview/AwContents.java

Index: android_webview/java/src/org/chromium/android_webview/AwContents.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwContents.java b/android_webview/java/src/org/chromium/android_webview/AwContents.java
index d8a2eeaeced48d8890354e32058ddc5c3ed7c440..a4d2d257589262704ee9371382626a51db13c5b5 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwContents.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwContents.java
@@ -581,8 +581,8 @@ public class AwContents {
         mDIPScale = DeviceDisplayInfo.create(mContext).getDIPScale();
         mLayoutSizer.setDelegate(new AwLayoutSizerDelegate());
         mLayoutSizer.setDIPScale(mDIPScale);
-        mWebContentsDelegate = new AwWebContentsDelegateAdapter(this, contentsClient,
-                mContainerView, mContext);
+        mWebContentsDelegate = new AwWebContentsDelegateAdapter(
+                this, contentsClient, mContentViewClient, mContext, mContainerView);
         mContentsClientBridge = new AwContentsClientBridge(contentsClient,
                 mBrowserContext.getKeyStore(), AwContentsStatics.getClientCertLookupTable());
         mZoomControls = new AwZoomControls(this);
@@ -668,6 +668,13 @@ public class AwContents {
     }
 
     /**
+     * Called when the app has requested to exit fullscreen.
+     */
+    void requestExitFullscreen() {
+        mContentViewCore.getWebContents().exitFullscreen();
+    }
+
+    /**
      * Returns this {@link AwContents} to embedded mode, where the {@link AwContents} are drawn
      * in the WebView.
      */