Remove dependency on VectorPlatformDeviceEmf.

skia/ext/platform_device_win.h

 // Copyright (c) 2011 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 SKIA_EXT_PLATFORM_DEVICE_WIN_H_
 #define SKIA_EXT_PLATFORM_DEVICE_WIN_H_
 #pragma once
 
 #include <windows.h>
 
@@ skipping 34 matching lines @@
   // source device will be copied.
   virtual void DrawToNativeContext(HDC dc, int x, int y,
                                    const RECT* src_rect) = 0;
 
   // Sets the opacity of each pixel in the specified region to be opaque.
   virtual void MakeOpaque(int x, int y, int width, int height) { }
 
   // Returns if GDI is allowed to render text to this device.
   virtual bool IsNativeFontRenderingAllowed() { return true; }
 
+  // Used by the printing subclasses.  See |VectorPlatformDeviceEmf|.
+  virtual bool AlphaBlendUsed() const { return false; }

[alokp, 2011/08/04 16:06:54]

Could you add a comment what it means?

[vandebo (ex-Chrome), 2011/08/04 16:28:44]

In case you aren't sure... Some printers don't support alpha blending, so in
those cases, we flatten the EMF before sending it to the printer.  This flag
helps us decide if we need to do that.

[Jeff Timanus, 2011/08/04 16:30:33]

Done.

+
   // Loads a SkPath into the GDI context. The path can there after be used for
   // clipping or as a stroke. Returns false if the path failed to be loaded.
   static bool LoadPathToDC(HDC context, const SkPath& path);
 
   // Loads a SkRegion into the GDI context.
   static void LoadClippingRegionToDC(HDC context, const SkRegion& region,
                                      const SkMatrix& transformation);
 
  protected:
   // Arrays must be inside structures.
@@ skipping 11 matching lines @@
   static void LoadTransformToDC(HDC dc, const SkMatrix& matrix);
 
   // Transforms SkPath's paths into a series of cubic path.
   static bool SkPathToCubicPaths(CubicPaths* paths, const SkPath& skpath);
 };
 
 }  // namespace skia
 
 #endif  // SKIA_EXT_PLATFORM_DEVICE_WIN_H_