cc: Use the correct internal format for glCopyTexImage2D calls.

android_webview/browser/parent_output_surface.cc

Index: android_webview/browser/parent_output_surface.cc
diff --git a/android_webview/browser/parent_output_surface.cc b/android_webview/browser/parent_output_surface.cc
index 22bcaf0731361078f2077d152b9f356a03610f4f..601c487fa6b83fae0e7bf1d523375a2ce3bca28d 100644
--- a/android_webview/browser/parent_output_surface.cc
+++ b/android_webview/browser/parent_output_surface.cc
@@ -4,13 +4,14 @@
 
 #include "android_webview/browser/parent_output_surface.h"
 
+#include "android_webview/browser/aw_render_thread_context_provider.h"
 #include "cc/output/output_surface_client.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
 
 namespace android_webview {
 
 ParentOutputSurface::ParentOutputSurface(
-    scoped_refptr<cc::ContextProvider> context_provider)
+    scoped_refptr<AwRenderThreadContextProvider> context_provider)
     : cc::OutputSurface(std::move(context_provider), nullptr, nullptr) {
   stencil_state_.stencil_test_enabled = false;
 }
@@ -54,6 +55,11 @@ void ParentOutputSurface::ApplyExternalStencil() {
                         stencil_state_.stencil_back_z_pass_op);
 }
 
+uint32_t ParentOutputSurface::GetFramebufferCopyTextureFormat() {
+  auto* gl = static_cast<AwRenderThreadContextProvider*>(context_provider());
+  return gl->GetCopyTextureInternalFormat();
+}
+
 void ParentOutputSurface::SetGLState(const ScopedAppGLStateRestore& gl_state) {
   stencil_state_ = gl_state.stencil_state();
   SetExternalStencilTest(stencil_state_.stencil_test_enabled);