Add support for ContentViewCore helpers on Tab

chrome/browser/android/tab_android.h

Index: chrome/browser/android/tab_android.h
diff --git a/chrome/browser/android/tab_android.h b/chrome/browser/android/tab_android.h
index 182e79987522d4224209181bf26a43b5c114c544..ac8e397626766f4e10f3d4c66c24d588cd3b5f2f 100644
--- a/chrome/browser/android/tab_android.h
+++ b/chrome/browser/android/tab_android.h
@@ -25,6 +25,10 @@ class GURL;
 class Profile;
 class SkBitmap;
 
+namespace cc {
+class Layer;
+}
+
 namespace chrome {
 struct NavigateParams;
 }
@@ -32,6 +36,7 @@ struct NavigateParams;
 namespace chrome {
 namespace android {
 class ChromeWebContentsDelegateAndroid;
+class TabContentManager;
 }
 }
 
@@ -78,6 +83,9 @@ class TabAndroid : public CoreTabHelperDelegate,
   // Return the WebContents, if any, currently owned by this TabAndroid.
   content::WebContents* web_contents() const { return web_contents_.get(); }
 
+  // Return the cc::Layer that represents the content for this TabAndroid.
+  scoped_refptr<cc::Layer> GetContentLayer() const;
+
   // Return specific id information regarding this TabAndroid.
   const SessionID& session_id() const { return session_tab_id_; }
   int GetAndroidId() const;
@@ -186,6 +194,20 @@ class TabAndroid : public CoreTabHelperDelegate,
                                       jobject obj,
                                       jobject delegate);
 
+  // TODO(dtrainor): Remove this, pull content_layer() on demand.
+  void AttachToTabContentManager(JNIEnv* env,
+                                 jobject obj,
+                                 jobject jtab_content_manager);
+
+  void AttachOverlayContentViewCore(JNIEnv* env,
+                                    jobject obj,
+                                    jobject jcontent_view_core,
+                                    jboolean visible);
+
+  void DetachOverlayContentViewCore(JNIEnv* env,
+                                    jobject obj,
+                                    jobject jcontent_view_core);
+
   // Register the Tab's native methods through JNI.
   static bool RegisterTabAndroid(JNIEnv* env);
 
@@ -202,6 +224,9 @@ class TabAndroid : public CoreTabHelperDelegate,
 
   content::NotificationRegistrar notification_registrar_;
 
+  scoped_refptr<cc::Layer> content_layer_;
+  chrome::android::TabContentManager* tab_content_manager_;
+
   scoped_ptr<content::WebContents> web_contents_;
   scoped_ptr<chrome::android::ChromeWebContentsDelegateAndroid>
       web_contents_delegate_;