Make reftests work for sky.

sky/compositor/layer.cc

Index: sky/compositor/layer.cc
diff --git a/sky/compositor/layer.cc b/sky/compositor/layer.cc
index 8d2ec8bc811276c8cc19093c7707a95ef7718221..23801c77cc81e475afb5e48e8daf9d9fa9df35ca 100644
--- a/sky/compositor/layer.cc
+++ b/sky/compositor/layer.cc
@@ -7,11 +7,16 @@
 #include "base/debug/trace_event.h"
 #include "mojo/skia/ganesh_surface.h"
 #include "sky/compositor/layer_host.h"
+#include "third_party/skia/include/core/SkBitmapDevice.h"
 #include "third_party/skia/include/core/SkCanvas.h"
+#include "ui/gfx/codec/png_codec.h"
 
 namespace sky {
 
-Layer::Layer(LayerClient* client) : client_(client), host_(nullptr) {
+Layer::Layer(LayerClient* client, bool is_testing)
+  : client_(client),
+    host_(nullptr),
+    is_testing_(is_testing) {
 }
 
 Layer::~Layer() {
@@ -25,6 +30,14 @@ void Layer::SetSize(const gfx::Size& size) {
   size_ = size;
 }
 
+std::string Layer::GetPixels() {
+  std::vector<unsigned char> png_data;
+  bool encoding_succeeded = gfx::PNGCodec::EncodeBGRASkBitmap(bitmap_, false, &png_data);
+  if (encoding_succeeded)
+    return std::string(reinterpret_cast<const char*>(&png_data[0]), png_data.size());
+  return std::string();
+}
+
 void Layer::Display() {
   TRACE_EVENT0("sky", "Layer::Display");
 
@@ -35,9 +48,21 @@ void Layer::Display() {
 
   SkCanvas* canvas = surface.canvas();
 
-  gfx::Rect rect(size_);
-  client_->PaintContents(canvas, rect);
-  canvas->flush();
+  if (is_testing_) {
+    bitmap_.reset();
+    bitmap_.allocN32Pixels(size_.width(), size_.height());
+    SkBitmapDevice device(bitmap_);
+    SkCanvas bitmapCanvas(&device);
+
+    gfx::Rect bitmapRect(size_);
+    bitmapCanvas.drawColor(SK_ColorRED);

[ojan, 2014/12/12 03:48:39]

This lets us see if if we don't paint at all. Not sure if we want to keep this.
It was useful in debugging as I put this patch together.

+    client_->PaintContents(&bitmapCanvas, bitmapRect);
+    bitmapCanvas.flush();
+  } else {
+    gfx::Rect rect(size_);
+    client_->PaintContents(canvas, rect);
+    canvas->flush();
+  }
 
   texture_ = surface.TakeTexture();
 }