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

content/renderer/webgraphicscontext3d_provider_impl.h

Index: content/renderer/webgraphicscontext3d_provider_impl.h
diff --git a/content/renderer/webgraphicscontext3d_provider_impl.h b/content/renderer/webgraphicscontext3d_provider_impl.h
index 769dd5685c579e472c3f1aaa1bbdf804dba61899..44d465ea68935350ef3535b50da55a50bdef6711 100644
--- a/content/renderer/webgraphicscontext3d_provider_impl.h
+++ b/content/renderer/webgraphicscontext3d_provider_impl.h
@@ -14,6 +14,12 @@ namespace cc_blink {
 class ContextProviderWebContext;
 }
 
+namespace gpu {
+namespace gles2 {
+class GLES2Interface;
+}
+}
+
 namespace content {
 
 class CONTENT_EXPORT WebGraphicsContext3DProviderImpl
@@ -26,6 +32,7 @@ class CONTENT_EXPORT WebGraphicsContext3DProviderImpl
   // WebGraphicsContext3DProvider implementation.
   blink::WebGraphicsContext3D* context3d() override;
   GrContext* grContext() override;
+  gpu::gles2::GLES2Interface* getGLInterface() override;
 
  private:
   scoped_refptr<cc_blink::ContextProviderWebContext> provider_;