Update from https://crrev.com/311076

cc/debug/picture_debug_util.cc

+// Copyright 2015 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.
+
+#include "cc/debug/picture_debug_util.h"
+
+#include <vector>
+
+#include "base/base64.h"
+#include "base/memory/scoped_ptr.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "third_party/skia/include/core/SkData.h"
+#include "third_party/skia/include/core/SkImageInfo.h"
+#include "third_party/skia/include/core/SkPicture.h"
+#include "third_party/skia/include/core/SkPixelSerializer.h"
+#include "third_party/skia/include/core/SkStream.h"
+#include "ui/gfx/codec/jpeg_codec.h"
+#include "ui/gfx/codec/png_codec.h"
+
+namespace {
+
+class BitmapSerializer : public SkPixelSerializer {
+ protected:
+  bool onUseEncodedData(const void* data, size_t len) override { return true; }
+
+  SkData* onEncodePixels(const SkImageInfo& info,
+                         const void* pixels,
+                         size_t row_bytes) override {
+    const int kJpegQuality = 80;
+    std::vector<unsigned char> data;
+
+    // If bitmap is opaque, encode as JPEG.
+    // Otherwise encode as PNG.
+    bool encoding_succeeded = false;
+    if (info.isOpaque()) {
+      encoding_succeeded =
+          gfx::JPEGCodec::Encode(reinterpret_cast<const unsigned char*>(pixels),
+                                 gfx::JPEGCodec::FORMAT_SkBitmap, info.width(),
+                                 info.height(), row_bytes, kJpegQuality, &data);
+    } else {
+      SkBitmap bm;
+      // The cast is ok, since we only read the bm.
+      if (!bm.installPixels(info, const_cast<void*>(pixels), row_bytes)) {
+        return nullptr;
+      }
+      encoding_succeeded = gfx::PNGCodec::EncodeBGRASkBitmap(bm, false, &data);
+    }
+
+    if (encoding_succeeded) {
+      return SkData::NewWithCopy(&data.front(), data.size());
+    }
+    return nullptr;
+  }
+};
+
+}  // namespace
+
+namespace cc {
+
+void PictureDebugUtil::SerializeAsBase64(const SkPicture* picture,
+                                         std::string* output) {
+  SkDynamicMemoryWStream stream;
+  BitmapSerializer serializer;
+  picture->serialize(&stream, &serializer);
+
+  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);
+}
+
+}  // namespace cc