[Android] Expose method for UI to force composites

content/browser/android/content_view_render_view.cc

 // Copyright (c) 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_render_view.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/bind.h"
@@ skipping 102 matching lines @@
   if (current_surface_format_ != format) {
     current_surface_format_ = format;
     compositor_->SetSurface(surface);
   }
   compositor_->SetWindowBounds(gfx::Size(width, height));
 }
 
 void ContentViewRenderView::SetOverlayVideoMode(
     JNIEnv* env, jobject obj, bool enabled) {
   compositor_->SetHasTransparentBackground(enabled);
+  SetNeedsComposite(env, obj);
+}
+
+void ContentViewRenderView::SetNeedsComposite(JNIEnv* env, jobject obj) {
+  if (compositor_)
+    compositor_->SetNeedsComposite();
 }
 
 void ContentViewRenderView::Layout() {
   JNIEnv* env = base::android::AttachCurrentThread();
   Java_ContentViewRenderView_onCompositorLayout(env, java_obj_.obj());
 }
 
 void ContentViewRenderView::OnSwapBuffersCompleted(int pending_swap_buffers) {
   JNIEnv* env = base::android::AttachCurrentThread();
   Java_ContentViewRenderView_onSwapBuffersCompleted(env, java_obj_.obj());
 }
 
 void ContentViewRenderView::InitCompositor() {
   if (!compositor_)
     compositor_.reset(Compositor::Create(this, root_window_));
 }
 }  // namespace content