Fix handling of Mac accelerated plugin layers across tab switch.

chrome/browser/renderer_host/accelerated_surface_container_mac.h

Index: chrome/browser/renderer_host/accelerated_surface_container_mac.h
diff --git a/chrome/browser/renderer_host/accelerated_surface_container_mac.h b/chrome/browser/renderer_host/accelerated_surface_container_mac.h
index 393487fae703a7788f853c6c1f36d27e205c2572..3233350d71bb8a9a428f9a27736b484ad3855d5b 100644
--- a/chrome/browser/renderer_host/accelerated_surface_container_mac.h
+++ b/chrome/browser/renderer_host/accelerated_surface_container_mac.h
@@ -67,6 +67,10 @@ class AcceleratedSurfaceContainerMac {
   // coordinate system will work out.
   void Draw(CGLContextObj context);
 
+  // Causes the next Draw call to trigger a texture upload. Should be called any
+  // time the drawing context has changed.
+  void ForceTextureReload() { texture_needs_upload_ = true; }
+
   // Enqueue our texture for later deletion. Call this before deleting
   // this object.
   void EnqueueTextureForDeletion(
@@ -104,6 +108,9 @@ class AcceleratedSurfaceContainerMac {
   // with it.
   GLuint texture_;
 
+  // True if we need to upload the texture again during the next draw.
+  bool texture_needs_upload_;
+
   DISALLOW_COPY_AND_ASSIGN(AcceleratedSurfaceContainerMac);
 };