rename getBitmapDC to beginPlatformPaint and add calls to endPlatformPaint

skia/ext/platform_canvas_linux.cc

Index: skia/ext/platform_canvas_linux.cc
diff --git a/skia/ext/platform_canvas_linux.cc b/skia/ext/platform_canvas_linux.cc
index 5d3594e6056a1e73ae25da1adbff1f79ba374ec4..fc038f9c559634b1e5378ff19834cb82fd1a63fa 100644
--- a/skia/ext/platform_canvas_linux.cc
+++ b/skia/ext/platform_canvas_linux.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -33,11 +33,11 @@ bool PlatformCanvas::initialize(int width, int height, bool is_opaque,
       width, height, is_opaque, data));
 }
 
-cairo_t* PlatformCanvas::beginPlatformPaint() {
+cairo_t* PlatformCanvas::beginPlatformPaint() const {
   return getTopPlatformDevice().beginPlatformPaint();
 }
 
-void PlatformCanvas::endPlatformPaint() {
+void PlatformCanvas::endPlatformPaint() const {
   // We don't need to do anything on Linux here.
 }