Make canvas code a bit more resilient to crashes....

base/gfx/vector_canvas.h

 // Copyright (c) 2006-2008 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 BASE_GFX_VECTOR_CANVAS_H_
 #define BASE_GFX_VECTOR_CANVAS_H_
 
 #include "base/gfx/platform_canvas_win.h"
 #include "base/gfx/vector_device.h"
 
 namespace gfx {
 
 // This class is a specialization of the regular PlatformCanvas. It is designed
 // to work with a VectorDevice to manage platform-specific drawing. It allows
 // using both Skia operations and platform-specific operations. It *doesn't*
 // support reading back from the bitmap backstore since it is not used.
 class VectorCanvas : public PlatformCanvasWin {
  public:
   VectorCanvas();
   VectorCanvas(HDC dc, int width, int height);
   virtual ~VectorCanvas();
 
   // For two-part init, call if you use the no-argument constructor above
-  void initialize(HDC context, int width, int height);
+  bool initialize(HDC context, int width, int height);
 
   virtual SkBounder* setBounder(SkBounder*);
   virtual SkDevice* createDevice(SkBitmap::Config config,
                                  int width, int height,
                                  bool is_opaque, bool isForLayer);
   virtual SkDrawFilter* setDrawFilter(SkDrawFilter* filter);
 
  private:
   // |is_opaque| is unused. |shared_section| is in fact the HDC used for output.
   virtual SkDevice* createPlatformDevice(int width, int height, bool is_opaque,
                                          HANDLE shared_section);
 
   // Returns true if the top device is vector based and not bitmap based.
   bool IsTopDeviceVectorial() const;
 
   DISALLOW_COPY_AND_ASSIGN(VectorCanvas);
 };
 
 }  // namespace gfx
 
 #endif  // BASE_GFX_VECTOR_CANVAS_H_