cc: Add base64 encoding to picture

cc/resources/picture.cc

Index: cc/resources/picture.cc
diff --git a/cc/resources/picture.cc b/cc/resources/picture.cc
index 2b6eca8777fbc0c3d7d280170d3f7008ce85d990..d7ec0d9ecdd8da7294de294a30810db87642aa9d 100644
--- a/cc/resources/picture.cc
+++ b/cc/resources/picture.cc
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "base/base64.h"
 #include "base/debug/trace_event.h"
 #include "cc/debug/rendering_stats.h"
 #include "cc/layers/content_layer_client.h"
@@ -11,6 +12,7 @@
 #include "third_party/skia/include/core/SkData.h"
 #include "third_party/skia/include/core/SkDrawFilter.h"
 #include "third_party/skia/include/core/SkPaint.h"
+#include "third_party/skia/include/core/SkStream.h"
 #include "third_party/skia/include/utils/SkPictureUtils.h"
 #include "ui/gfx/rect_conversions.h"
 #include "ui/gfx/skia_util.h"
@@ -150,6 +152,23 @@ void Picture::Raster(
   canvas->restore();
 }
 
+void Picture::AsBase64String(std::string* output) const {

[tfarina, 2013/04/13 00:49:01]

the order of implementation should match with the declaration. i.e. move this
right after GatherPixelRefs().

+  SkDynamicMemoryWStream stream;
+  picture_->serialize(&stream);
+  size_t serialized_size = stream.bytesWritten();
+  scoped_ptr<char[]> serialized_picture(new char[serialized_size]);
+  stream.copyTo(serialized_picture.get());
+  base::Base64Encode(std::string(serialized_picture.get(), serialized_size),
+                     output);
+}
+
+void Picture::SetPictureFromBase64String(const std::string & encoded) {
+  std::string decoded;
+  base::Base64Decode(encoded, &decoded);
+  SkMemoryStream stream(decoded.data(), decoded.size());
+  picture_ = skia::AdoptRef(new SkPicture(&stream));
+}
+
 void Picture::GatherPixelRefs(const gfx::Rect& layer_rect,
                               std::list<skia::LazyPixelRef*>& pixel_ref_list) {
   DCHECK(picture_);