Expose GLES2Interface to blink, and delete isContextLost() from WGC3D.

gpu/blink/webgraphicscontext3d_impl.h

Index: gpu/blink/webgraphicscontext3d_impl.h
diff --git a/gpu/blink/webgraphicscontext3d_impl.h b/gpu/blink/webgraphicscontext3d_impl.h
index 91881ba28d7ea6bff3ca11109534d23682a0cd29..ab5ab3a291a9e04dda7c4d552b67788736bda8b2 100644
--- a/gpu/blink/webgraphicscontext3d_impl.h
+++ b/gpu/blink/webgraphicscontext3d_impl.h
@@ -937,9 +937,11 @@ class GPU_BLINK_EXPORT WebGraphicsContext3DImpl
                 blink::WGC3Dbitfield flags,
                 blink::WGC3Duint64 timeout) override;
 
-  bool isContextLost() override;
   blink::WGC3Denum getGraphicsResetStatusARB() override;
 
+  // WebGraphicsContext3D implementation.
+  ::gpu::gles2::GLES2Interface* getGLES2Interface() override;
+
   ::gpu::gles2::GLES2Interface* GetGLInterface() {
     return gl_;
   }
@@ -959,9 +961,7 @@ class GPU_BLINK_EXPORT WebGraphicsContext3DImpl
       getErrorMessageCallback();
   virtual void OnErrorMessage(const std::string& message, int id);
 
-  void setGLInterface(::gpu::gles2::GLES2Interface* gl) {
-    gl_ = gl;
-  }
+  void SetGLInterface(::gpu::gles2::GLES2Interface* gl) { gl_ = gl; }
 
   bool initialized_;
   bool initialize_failed_;