Hide plugin views when we start playing HTML5 video

Plugins like Flash draw directly to the screen on top
of all other views - including the fullscreen HTML5 video
view. This means that if you start an HTML5 video on a page
also serving a flash clip then flash will obscure the video.

This patch hides plugin views before start the video and shows
them again when the VideoView is destroyed.

Bug: 3183521
Change-Id: I9839c47e9d64b081651b952057e9283630362b29

core/java/android/webkit/HTML5VideoViewProxy.java

@@ -138,6 +138,10 @@ class HTML5VideoViewProxy extends Handler
                         mCurrentProxy.dispatchOnEnded();
                     else
                         mCurrentProxy.dispatchOnPaused();
+
+                    // Re enable plugin views.
+                    mCurrentProxy.getWebView().getViewManager().showAll();
+
                     isVideoSelfEnded = false;
                     mCurrentProxy = null;
                     mLayout.removeView(mVideoView);
@@ -199,6 +203,9 @@ class HTML5VideoViewProxy extends Handler
             mTimer = new Timer();
             mVideoView.start();
             client.onShowCustomView(mLayout, mCallback);
+            // Plugins like Flash will draw over the video so hide
+            // them while we're playing.
+            mCurrentProxy.getWebView().getViewManager().hideAll();
         }
 
         public static boolean isPlaying(HTML5VideoViewProxy proxy) {
@@ -599,6 +606,10 @@ class HTML5VideoViewProxy extends Handler
         return new HTML5VideoViewProxy(webViewCore.getWebView(), nativePtr);
     }
 
+    /* package */ WebView getWebView() {
+        return mWebView;
+    }
+
     private native void nativeOnPrepared(int duration, int width, int height, int nativePointer);
     private native void nativeOnEnded(int nativePointer);
     private native void nativeOnPaused(int nativePointer);

core/java/android/webkit/WebView.java

@@ -7845,6 +7845,10 @@ public class WebView extends AbsoluteLayout
         nativeUpdateCachedTextfield(updatedText, mTextGeneration);
     }
 
+    /* package */ ViewManager getViewManager() {
+        return mViewManager;
+    }
+
     private native int nativeCacheHitFramePointer();
     private native Rect nativeCacheHitNodeBounds();
     private native int nativeCacheHitNodePointer();