[tracing] Don't use dot-based path expansion in TracedValue

cc/playback/display_item_list.cc

 // Copyright 2014 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/playback/display_item_list.h"
 
 #include <string>
 
 #include "base/numerics/safe_conversions.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 213 matching lines @@
 bool DisplayItemList::ShouldBeAnalyzedForSolidColor() const {
   return ApproximateOpCount() <= kOpCountThatIsOkToAnalyze;
 }
 
 scoped_refptr<base::trace_event::ConvertableToTraceFormat>
 DisplayItemList::AsValue(bool include_items) const {
   DCHECK(ProcessAppendedItemsCalled());
   scoped_refptr<base::trace_event::TracedValue> state =
       new base::trace_event::TracedValue();
 
+  state->BeginDictionary("params");
   if (include_items) {
-    state->BeginArray("params.items");
+    state->BeginArray("items");
     for (const DisplayItem* item : items_) {
       item->AsValueInto(state.get());
     }
-    state->EndArray();
+    state->EndArray();  // "items".
   }
-
-  state->SetValue("params.layer_rect", MathUtil::AsValue(layer_rect_));
+  state->SetValue("layer_rect", MathUtil::AsValue(layer_rect_));
+  state->EndDictionary();  // "params".
 
   if (!layer_rect_.IsEmpty()) {
     SkPictureRecorder recorder;
     SkCanvas* canvas =
         recorder.beginRecording(layer_rect_.width(), layer_rect_.height());
     canvas->translate(-layer_rect_.x(), -layer_rect_.y());
     canvas->clipRect(gfx::RectToSkRect(layer_rect_));
     Raster(canvas, NULL, gfx::Rect(), 1.f);
     skia::RefPtr<SkPicture> picture =
         skia::AdoptRef(recorder.endRecordingAsPicture());
@@ skipping 23 matching lines @@
   DCHECK(picture_);
   DCHECK(!images_);
   images_ = make_scoped_ptr(new DiscardableImageMap(grid_cell_size));
   if (!picture_->willPlayBackBitmaps())
     return;
 
   images_->GatherImagesFromPicture(picture_.get(), layer_rect_);
 }
 
 }  // namespace cc