Expose IsSolidColor and write units tests

cc/resources/picture.cc

Index: cc/resources/picture.cc
diff --git a/cc/resources/picture.cc b/cc/resources/picture.cc
index e206e8db5070b380a1bce6faa8d54a2037c39e98..41bef6602c6bcf45d8e1f158e5a9994509c73889 100644
--- a/cc/resources/picture.cc
+++ b/cc/resources/picture.cc
@@ -217,6 +217,11 @@ bool Picture::IsSuitableForGpuRasterization() const {
   return picture_->suitableForGpuRasterization(NULL);
 }
 
+int Picture::GetApproximateOpCount() const {
+  DCHECK(picture_);
+  return picture_->approximateOpCount();
+}
+
 void Picture::CloneForDrawing(int num_threads) {
   TRACE_EVENT1("cc", "Picture::CloneForDrawing", "num_threads", num_threads);
 
@@ -417,6 +422,21 @@ int Picture::Raster(
   return bounds.width() * bounds.height();
 }
 
+void Picture::RasterForAnalysis(SkCanvas* canvas) {
+  TRACE_EVENT0("cc", "Picture::AnalysisRaster");
+  DCHECK(picture_);
+
+  canvas->save();
+
+  canvas->translate(layer_rect_.x(), layer_rect_.y());
+  if (playback_) {
+    playback_->draw(canvas);
+  } else {
+    picture_->draw(canvas, NULL);

[vmpstr, 2014/08/20 16:12:00]

Make a comment here please explaining why we don't use a callback (if a DCHECK
for op count here can be put in, that would be nice as well; but, if it's going
to have 2 hard coded constants that are the same then don't do it)

[hendrikw, 2014/08/20 20:46:55]

Acknowledged.

+  }
+  canvas->restore();
+}
+
 void Picture::Replay(SkCanvas* canvas) {
   if (!playback_)
     DCHECK(raster_thread_checker_.CalledOnValidThread());