cc: Use the correct internal format for glCopyTexImage2D calls.

content/common/gpu/client/context_provider_command_buffer.cc

Index: content/common/gpu/client/context_provider_command_buffer.cc
diff --git a/content/common/gpu/client/context_provider_command_buffer.cc b/content/common/gpu/client/context_provider_command_buffer.cc
index 4b24d0134b627df9ebe048dcb6082e6c113c7f7e..857d0938615048c7e673d780452c4fe6d9837c00 100644
--- a/content/common/gpu/client/context_provider_command_buffer.cc
+++ b/content/common/gpu/client/context_provider_command_buffer.cc
@@ -111,6 +111,15 @@ ContextProviderCommandBuffer::GetCommandBufferProxy() {
   return command_buffer_.get();
 }
 
+uint32_t ContextProviderCommandBuffer::GetCopyTextureInternalFormat() {
+  if (attributes_.alpha_size > 0)
+    return GL_RGBA;
+  DCHECK_NE(attributes_.red_size, 0);
+  DCHECK_NE(attributes_.green_size, 0);
+  DCHECK_NE(attributes_.blue_size, 0);
+  return GL_RGB;
+}
+
 bool ContextProviderCommandBuffer::BindToCurrentThread() {
   // This is called on the thread the context will be used.
   DCHECK(context_thread_checker_.CalledOnValidThread());