gpu: Move ContextProviderCommandBuffer into mus gpu client-lib.

content/browser/compositor/offscreen_browser_compositor_output_surface.h

Index: content/browser/compositor/offscreen_browser_compositor_output_surface.h
diff --git a/content/browser/compositor/offscreen_browser_compositor_output_surface.h b/content/browser/compositor/offscreen_browser_compositor_output_surface.h
index 141a5a6943f98aa2d1d25088a8c318b3e3c796ce..d54f6b4282ff70f7fb88059f845fe2e78b3f6f05 100644
--- a/content/browser/compositor/offscreen_browser_compositor_output_surface.h
+++ b/content/browser/compositor/offscreen_browser_compositor_output_surface.h
@@ -15,15 +15,18 @@
 #include "build/build_config.h"
 #include "content/browser/compositor/browser_compositor_output_surface.h"
 
-namespace content {
+namespace ui {
 class ContextProviderCommandBuffer;
+}
+
+namespace content {
 class ReflectorTexture;
 
 class OffscreenBrowserCompositorOutputSurface
     : public BrowserCompositorOutputSurface {
  public:
   OffscreenBrowserCompositorOutputSurface(
-      scoped_refptr<ContextProviderCommandBuffer> context,
+      scoped_refptr<ui::ContextProviderCommandBuffer> context,
       const UpdateVSyncParametersCallback& update_vsync_parameters_callback,
       std::unique_ptr<display_compositor::CompositorOverlayCandidateValidator>
           overlay_candidate_validator);