Mac/gpu: Don't show uninitialized surfaces while resizing plugins / composited tabs.

chrome/browser/renderer_host/accelerated_surface_container_manager_mac.cc

Index: chrome/browser/renderer_host/accelerated_surface_container_manager_mac.cc
diff --git a/chrome/browser/renderer_host/accelerated_surface_container_manager_mac.cc b/chrome/browser/renderer_host/accelerated_surface_container_manager_mac.cc
index 77be3ace4bf562d4e5984afc2ffc9dd21db7fb90..b123f768336adaf2a0219448ff5ab196cdfa240d 100644
--- a/chrome/browser/renderer_host/accelerated_surface_container_manager_mac.cc
+++ b/chrome/browser/renderer_host/accelerated_surface_container_manager_mac.cc
@@ -99,7 +99,10 @@ void AcceleratedSurfaceContainerManagerMac::Draw(CGLContextObj context,
   AutoLock lock(lock_);
 
   glColorMask(true, true, true, true);
-  glClearColor(0, 0, 0, 0);
+  // Should match the clear color of RenderWidgetHostViewMac.
+  glClearColor(255, 255, 255, 255);

[stuartmorgan, 2010/11/05 17:35:26]

This needs to be conditional on the surface being opaque, with the transparent
version still using 0, 0, 0, 0. We have an opaque flag at this layer, so we can
do it correctly now and not have this bite us later when we get transparent
support.

(I don't remember whether we set opaque for plugins right now; if not we should
change that and put a TODO there.)

+  // TODO(thakis): Clearing the whole color buffer is wasteful, since most of
+  // it is overwritten by the surface.
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
   glDisable(GL_DEPTH_TEST);
   glDisable(GL_BLEND);