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

content/renderer/webgraphicscontext3d_provider_impl.cc

Index: content/renderer/webgraphicscontext3d_provider_impl.cc
diff --git a/content/renderer/webgraphicscontext3d_provider_impl.cc b/content/renderer/webgraphicscontext3d_provider_impl.cc
index 855bd3df44d514215d3058a32c4122a7a88e7758..db5a84c08b50dbe01837cf3bd3941b8286235b31 100644
--- a/content/renderer/webgraphicscontext3d_provider_impl.cc
+++ b/content/renderer/webgraphicscontext3d_provider_impl.cc
@@ -16,6 +16,7 @@ WebGraphicsContext3DProviderImpl::WebGraphicsContext3DProviderImpl(
 WebGraphicsContext3DProviderImpl::~WebGraphicsContext3DProviderImpl() {}
 
 blink::WebGraphicsContext3D* WebGraphicsContext3DProviderImpl::context3d() {
+  DCHECK_EQ(!!provider_->WebContext3D(), !!provider_->ContextGL());
   return provider_->WebContext3D();
 }
 
@@ -23,4 +24,9 @@ GrContext* WebGraphicsContext3DProviderImpl::grContext() {
   return provider_->GrContext();
 }
 
+gpu::gles2::GLES2Interface* WebGraphicsContext3DProviderImpl::getGLInterface() {
+  DCHECK_EQ(!!provider_->WebContext3D(), !!provider_->ContextGL());
+  return provider_->ContextGL();
+}
+
 }  // namespace content