Adds kind-of-live thumbnail generation for a potential tab switcher. This...

chrome/browser/renderer_host/render_widget_host_view_mac.mm

Index: chrome/browser/renderer_host/render_widget_host_view_mac.mm
===================================================================
--- chrome/browser/renderer_host/render_widget_host_view_mac.mm	(revision 17971)
+++ chrome/browser/renderer_host/render_widget_host_view_mac.mm	(working copy)
@@ -267,7 +267,7 @@
 
 BackingStore* RenderWidgetHostViewMac::AllocBackingStore(
     const gfx::Size& size) {
-  return new BackingStore(size);
+  return new BackingStore(render_widget_host_, size);
 }
 
 // Display a popup menu for WebKit using Cocoa widgets.
@@ -385,7 +385,7 @@
   renderWidgetHostView_->invalid_rect_ = dirtyRect;
   renderWidgetHostView_->about_to_validate_and_paint_ = true;
   BackingStore* backing_store =
-      renderWidgetHostView_->render_widget_host_->GetBackingStore();
+      renderWidgetHostView_->render_widget_host_->GetBackingStore(true);
   skia::PlatformCanvas* canvas = backing_store->canvas();
   renderWidgetHostView_->about_to_validate_and_paint_ = false;
   dirtyRect = renderWidgetHostView_->invalid_rect_;
@@ -459,7 +459,7 @@
     // We're dead, so becoming first responder is probably a bad idea.
     return NO;
   }
-  
+
   renderWidgetHostView_->render_widget_host_->Focus();
   return YES;
 }
@@ -470,7 +470,7 @@
     // idea.
     return YES;
   }
-  
+
   if (closeOnDeactivate_)
     renderWidgetHostView_->KillSelf();