android: Expose content locks in RenderWidgetHostViewAndroid

content/browser/android/content_view_core_impl.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/android/content_view_core_impl.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
@@ skipping 1831 matching lines @@
       env, obj.obj(), jresult.obj());
 }
 
 void ContentViewCoreImpl::WebContentsDestroyed(WebContents* web_contents) {
   WebContentsViewAndroid* wcva =
       static_cast<WebContentsViewAndroid*>(web_contents->GetView());
   DCHECK(wcva);
   wcva->SetContentViewCore(NULL);
 }
 
+
+jboolean ContentViewCoreImpl::CanLockContent(JNIEnv* env, jobject obj) {
+  RenderWidgetHostViewAndroid* rwhva = GetRenderWidgetHostViewAndroid();
+  if (!rwhva || !rwhva->IsSurfaceAvailableForCopy() || !rwhva->IsShowing())
+    return false;
+  return true;
+}
+
+void ContentViewCoreImpl::LockContent(JNIEnv* env, jobject obj) {
+  RenderWidgetHostViewAndroid* rwhva = GetRenderWidgetHostViewAndroid();
+  if (rwhva)
+    rwhva->LockResources();
+}
+
+void ContentViewCoreImpl::UnlockContent(JNIEnv* env, jobject obj) {
+  RenderWidgetHostViewAndroid* rwhva = GetRenderWidgetHostViewAndroid();
+  if (rwhva)
+    rwhva->UnlockResources();
+}
+
 // This is called for each ContentView.
 jlong Init(JNIEnv* env,
            jobject obj,
            jlong native_web_contents,
            jlong view_android,
            jlong window_android) {
   ContentViewCoreImpl* view = new ContentViewCoreImpl(
       env, obj,
       reinterpret_cast<WebContents*>(native_web_contents),
       reinterpret_cast<ui::ViewAndroid*>(view_android),
       reinterpret_cast<ui::WindowAndroid*>(window_android));
   return reinterpret_cast<intptr_t>(view);
 }
 
 bool RegisterContentViewCore(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace content