[WebGL-chromium] Return meaningful information in WebGL context creation error message

content/renderer/renderer_blink_platform_impl.h

 // 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.
 
 #ifndef CONTENT_RENDERER_RENDERER_BLINK_PLATFORM_IMPL_H_
 #define CONTENT_RENDERER_RENDERER_BLINK_PLATFORM_IMPL_H_
 
 #include "base/compiler_specific.h"
 #include "base/id_map.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 113 matching lines @@
       blink::WebRTCPeerConnectionHandlerClient* client);
   virtual blink::WebMediaStreamCenter* createMediaStreamCenter(
       blink::WebMediaStreamCenterClient* client);
   virtual bool processMemorySizesInBytes(
       size_t* private_bytes, size_t* shared_bytes);
   virtual blink::WebGraphicsContext3D* createOffscreenGraphicsContext3D(
       const blink::WebGraphicsContext3D::Attributes& attributes);
   virtual blink::WebGraphicsContext3D* createOffscreenGraphicsContext3D(
       const blink::WebGraphicsContext3D::Attributes& attributes,
       blink::WebGraphicsContext3D* share_context);
+  virtual blink::WebGraphicsContext3D* createOffscreenGraphicsContext3D(
+      const blink::WebGraphicsContext3D::Attributes& attributes,
+      blink::WebGraphicsContext3D* share_context,
+      blink::WebGLInfo* gl_info);
   virtual blink::WebGraphicsContext3DProvider*
       createSharedOffscreenGraphicsContext3DProvider();
   virtual blink::WebCompositorSupport* compositorSupport();
   virtual blink::WebString convertIDNToUnicode(
       const blink::WebString& host, const blink::WebString& languages);
   virtual void startListening(blink::WebPlatformEventType,
                               blink::WebPlatformEventListener*);
   virtual void stopListening(blink::WebPlatformEventType);
   virtual void queryStorageUsageAndQuota(
       const blink::WebURL& storage_partition,
@@ skipping 94 matching lines @@
   scoped_ptr<BatteryStatusDispatcher> battery_status_dispatcher_;
 
   IDMap<PlatformEventObserverBase, IDMapOwnPointer> platform_event_observers_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererBlinkPlatformImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDERER_BLINK_PLATFORM_IMPL_H_