Add EncodeRGBAPNGWithChecksum method.

Adding this method is to dump image for DRT on Chromium Android port.
See https://bugs.webkit.org/show_bug.cgi?id=84682 for details.

NOTE. Skia pixel layout definition is in
<chrome-source-root>/third_party/skia/include/core/SkPostConfig.h for Chromium Android platform.
<chrome-source-root>/skia/config/SkUserConfig.h for other Chromium platforms.


BUG=None.
TEST=should not affect any tests.

Review URL: http://codereview.chromium.org/10202008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@133861 0039d316-1c4b-4281-b951-d872f2087c98

webkit/support/webkit_support_gfx.cc

@@ -676,4 +676,18 @@ bool EncodeBGRAPNGWithChecksum(const unsigned char* input,
       comments, output);
 }
 
+bool EncodeRGBAPNGWithChecksum(const unsigned char* input,
+                               int width,
+                               int height,
+                               int row_byte_width,
+                               bool discard_transparency,
+                               const std::string& checksum,
+                               std::vector<unsigned char>* output) {
+  std::vector<Comment> comments;
+  comments.push_back(Comment("checksum", checksum));
+  return Encode(input, FORMAT_RGBA,
+      width, height, row_byte_width, discard_transparency,
+      comments, output);
+}
+
 }  // namespace webkit_support

webkit/support/webkit_support_gfx.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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.
 
@@ -38,6 +38,14 @@ bool EncodeBGRAPNGWithChecksum(const unsigned char* input,
                                const std::string& checksum,
                                std::vector<unsigned char>* output);
 
+bool EncodeRGBAPNGWithChecksum(const unsigned char* input,
+                               int width,
+                               int height,
+                               int row_byte_width,
+                               bool discard_transparency,
+                               const std::string& checksum,
+                               std::vector<unsigned char>* output);
+
 }  // namespace webkit_support
 
 #endif  // WEBKIT_SUPPORT_WEBKIT_SUPPORT_GFX_H_