Fix crash in GotAcceleratedIOSurfaceFrame

content/browser/renderer_host/compositing_iosurface_layer_mac.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_COMPOSITING_IOSURFACE_LAYER_MAC_H_
 #define CONTENT_BROWSER_RENDERER_HOST_COMPOSITING_IOSURFACE_LAYER_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/scoped_cftyperef.h"
 #include "base/memory/ref_counted.h"
 #include "base/timer/timer.h"
 
 @class CompositingIOSurfaceLayer;
 
 namespace content {
 class CompositingIOSurfaceMac;
 class CompositingIOSurfaceContext;
 
 // The interface through which the CompositingIOSurfaceLayer calls back into
 // the structrue that created it (RenderWidgetHostViewMac or
 // BrowserCompositorViewMac).
 class CompositingIOSurfaceLayerClient {
  public:
+  // Used to indicate that the layer should attempt to draw immediately and
+  // should (even if the draw is elided by the system), ack the frame
+  // immediately.
   virtual bool AcceleratedLayerShouldAckImmediately() const = 0;
-  virtual void AcceleratedLayerDidDrawFrame(bool succeeded) = 0;
+
+  // Called when a frame is drawn or when, because the layer is not visible, it
+  // is known that the frame will never drawn.
+  virtual void AcceleratedLayerDidDrawFrame() = 0;
+
+  // Called when an error prevents the frame from being drawn.
+  virtual void AcceleratedLayerHitError() = 0;
 };
 
 // CompositingIOSurfaceLayerHelper provides C++ functionality needed for the
 // CompositingIOSurfaceLayer class, and does most of the heavy lifting for the
 // class.
 // TODO(ccameron): This class should own CompositingIOSurfaceLayer, rather than
 // vice versa.
 class CompositingIOSurfaceLayerHelper {
  public:
   CompositingIOSurfaceLayerHelper(CompositingIOSurfaceLayerClient* client,
@@ skipping 97 matching lines @@
 // Force a draw immediately, but only if one was requested.
 - (void)displayIfNeededAndAck;
 
 // Mark a bracket in which new frames are being pumped in a restricted nested
 // run loop.
 - (void)beginPumpingFrames;
 - (void)endPumpingFrames;
 @end
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_COMPOSITING_IOSURFACE_LAYER_MAC_H_