Reland: WTF: Implement explicit RefPtr::operator bool.

third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridge.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 718 matching lines @@
     if (m_contextProvider->contextGL()->GetGraphicsResetStatusKHR() != GL_NO_ERROR) {
         m_surface.clear();
         for (auto mailboxInfo = m_mailboxes.begin(); mailboxInfo != m_mailboxes.end(); ++mailboxInfo) {
             if (mailboxInfo->m_image)
                 mailboxInfo->m_image.clear();
         }
         if (m_imageBuffer)
             m_imageBuffer->notifySurfaceInvalid();
         CanvasMetrics::countCanvasContextUsage(CanvasMetrics::Accelerated2DCanvasGPUContextLost);
     }
-    return m_surface;
+    return m_surface.get();
 }
 
 bool Canvas2DLayerBridge::restoreSurface()
 {
     ASSERT(!m_destructionInProgress);
     if (m_destructionInProgress)
         return false;
     ASSERT(isAccelerated() && !m_surface);
 
     gpu::gles2::GLES2Interface* sharedGL = nullptr;
@@ skipping 14 matching lines @@
         // due to changes to the layer tree, which can only happen at specific times during the document lifecycle.
         // Therefore, we can only accept the restored surface if it is accelerated.
         if (surface && surfaceIsAccelerated) {
             m_surface = surface.release();
             // FIXME: draw sad canvas picture into new buffer crbug.com/243842
         }
     }
     if (m_imageBuffer)
         m_imageBuffer->updateGPUMemoryUsage();
 
-    return m_surface;
+    return m_surface.get();
 }
 
 bool Canvas2DLayerBridge::prepareMailbox(WebExternalTextureMailbox* outMailbox, WebExternalBitmap* bitmap)
 {
     if (m_destructionInProgress) {
         // It can be hit in the following sequence.
         // 1. Canvas draws something.
         // 2. The compositor begins the frame.
         // 3. Javascript makes a context be lost.
         // 4. Here.
@@ skipping 209 matching lines @@
 #endif // USE_IOSURFACE_FOR_2D_CANVAS
 }
 
 void Canvas2DLayerBridge::Logger::reportHibernationEvent(HibernationEvent event)
 {
     DEFINE_STATIC_LOCAL(EnumerationHistogram, hibernationHistogram, ("Canvas.HibernationEvents", HibernationEventCount));
     hibernationHistogram.count(event);
 }
 
 } // namespace blink