cc: Use the correct internal format for glCopyTexImage2D calls.

content/test/mailbox_output_surface.cc

 // Copyright 2016 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.
 
 #include "content/test/mailbox_output_surface.h"
 
 #include "base/logging.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/compositor_frame_ack.h"
 #include "cc/output/gl_frame_data.h"
@@ skipping 138 matching lines @@
 
   GLES2Interface* gl = context_provider_->ContextGL();
 
   if (!fbo_)
     gl->GenFramebuffers(1, &fbo_);
   gl->BindFramebuffer(GL_FRAMEBUFFER, fbo_);
   gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
                            current_backing_.texture_id, 0);
 }
 
+uint32_t MailboxOutputSurface::GetFramebufferCopyTextureFormat() {
+  return GLCopyTextureInternalFormat(cc::RGBA_8888);
+}
+
 void MailboxOutputSurface::OnSwapAck(uint32_t output_surface_id,
                                      const cc::CompositorFrameAck& ack) {
   // Ignore message if it's a stale one coming from a different output surface
   // (e.g. after a lost context).
   if (output_surface_id != output_surface_id_)
     return;
 
   if (!ack.gl_frame_data->mailbox.IsZero()) {
     DCHECK(!ack.gl_frame_data->size.IsEmpty());
     // The browser could be returning the oldest or any other pending texture
@@ skipping 90 matching lines @@
 
 MailboxOutputSurface::TransferableFrame::TransferableFrame() : texture_id(0) {}
 
 MailboxOutputSurface::TransferableFrame::TransferableFrame(
     uint32_t texture_id,
     const gpu::Mailbox& mailbox,
     const gfx::Size size)
     : texture_id(texture_id), mailbox(mailbox), size(size) {}
 
 }  // namespace content