Implement difference clip rects with window rectangles

gyp/gpu.gypi

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 # Include this gypi to include all 'gpu' files
 # The parent gyp/gypi file must define
 #       'skia_src_path'     e.g. skia/trunk/src
 #       'skia_include_path' e.g. skia/trunk/include
 #
 # The skia build defines these in common_variables.gypi
@@ skipping 182 matching lines @@
       '<(skia_src_path)/gpu/GrTextureParamsAdjuster.h',
       '<(skia_src_path)/gpu/GrTextureParamsAdjuster.cpp',
       '<(skia_src_path)/gpu/GrTexturePriv.h',
       '<(skia_src_path)/gpu/GrTextureProvider.cpp',
       '<(skia_src_path)/gpu/GrTextureProxy.cpp',
       '<(skia_src_path)/gpu/GrTextureToYUVPlanes.cpp',
       '<(skia_src_path)/gpu/GrTextureToYUVPlanes.h',
       '<(skia_src_path)/gpu/GrTextureAccess.cpp',
       '<(skia_src_path)/gpu/GrTRecorder.h',
       '<(skia_src_path)/gpu/GrUserStencilSettings.h',
+      '<(skia_src_path)/gpu/GrWindowRectangles.h',
       '<(skia_src_path)/gpu/GrXferProcessor.cpp',
       '<(skia_src_path)/gpu/GrYUVProvider.cpp',
       '<(skia_src_path)/gpu/GrYUVProvider.h',
 
       # Batches
       '<(skia_src_path)/gpu/batches/GrAAHairLinePathRenderer.cpp',
       '<(skia_src_path)/gpu/batches/GrAAHairLinePathRenderer.h',
       '<(skia_src_path)/gpu/batches/GrAALinearizingConvexPathRenderer.cpp',
       '<(skia_src_path)/gpu/batches/GrAALinearizingConvexPathRenderer.h',
       '<(skia_src_path)/gpu/batches/GrAAConvexTessellator.cpp',
@@ skipping 310 matching lines @@
       '<(skia_src_path)/gpu/gl/win/GrGLCreateNativeInterface_win.cpp',
       '<(skia_src_path)/gpu/gl/glx/GrGLCreateNativeInterface_glx.cpp',
       '<(skia_src_path)/gpu/gl/egl/GrGLCreateNativeInterface_egl.cpp',
       '<(skia_src_path)/gpu/gl/iOS/GrGLCreateNativeInterface_iOS.cpp',
       '<(skia_src_path)/gpu/gl/android/GrGLCreateNativeInterface_android.cpp',
     ],
     'skgpu_null_gl_sources': [
     ],
   },
 }