Null check the render layer as it might be gone when video enters/exits fullscreen

content/browser/renderer_host/render_widget_host_view_android.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/renderer_host/render_widget_host_view_android.h"
 
 #include <android/bitmap.h>
 
 #include "base/android/sys_utils.h"
 #include "base/basictypes.h"
@@ skipping 913 matching lines @@
     // Unblock the compositor.
     BrowserThread::PostTask(
         BrowserThread::UI, FROM_HERE,
         base::Bind(&RenderViewDevToolsAgentHost::SynchronousSwapCompositorFrame,
                    static_cast<RenderViewDevToolsAgentHost*>(dtah.get()),
                    frame_metadata));
   }
 }
 
 void RenderWidgetHostViewAndroid::SetOverlayVideoMode(bool enabled) {
-  layer_->SetContentsOpaque(!enabled);
+  if (layer_)
+    layer_->SetContentsOpaque(!enabled);
 }
 
 void RenderWidgetHostViewAndroid::SynchronousCopyContents(
     const gfx::Rect& src_subrect_in_pixel,
     const gfx::Size& dst_size_in_pixel,
     const base::Callback<void(bool, const SkBitmap&)>& callback,
     const SkBitmap::Config config) {
   SynchronousCompositor* compositor =
       SynchronousCompositorImpl::FromID(host_->GetProcess()->GetID(),
                                         host_->GetRoutingID());
@@ skipping 506 matching lines @@
   results->availableRect = display.work_area();
   results->deviceScaleFactor = display.device_scale_factor();
   results->orientationAngle = display.RotationAsDegree();
   gfx::DeviceDisplayInfo info;
   results->depth = info.GetBitsPerPixel();
   results->depthPerComponent = info.GetBitsPerComponent();
   results->isMonochrome = (results->depthPerComponent == 0);
 }
 
 } // namespace content