Add builders for tracing event's structural arguments

cc/trees/layer_tree_host_impl.cc

 // Copyright 2011 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/trees/layer_tree_host_impl.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/basictypes.h"
 #include "base/containers/hash_tables.h"
+#include "base/debug/trace_event_argument.h"
 #include "base/json/json_writer.h"
 #include "base/metrics/histogram.h"
 #include "base/stl_util.h"
 #include "base/strings/stringprintf.h"
 #include "cc/animation/animation_id_provider.h"
 #include "cc/animation/scroll_offset_animation_curve.h"
 #include "cc/animation/scrollbar_animation_controller.h"
 #include "cc/animation/timing_function.h"
 #include "cc/base/latency_info_swap_promise_monitor.h"
 #include "cc/base/math_util.h"
@@ skipping 498 matching lines @@
     render_surface->damage_tracker()->UpdateDamageTrackingState(
         render_surface->layer_list(),
         render_surface_layer->id(),
         render_surface->SurfacePropertyChangedOnlyFromDescendant(),
         render_surface->content_rect(),
         render_surface_layer->mask_layer(),
         render_surface_layer->filters());
   }
 }
 
-scoped_ptr<base::Value> LayerTreeHostImpl::FrameData::AsValue() const {
-  scoped_ptr<base::DictionaryValue> value(new base::DictionaryValue());
+void LayerTreeHostImpl::FrameData::AsValueInto(
+    base::debug::TracedValue* value) const {
   value->SetBoolean("contains_incomplete_tile", contains_incomplete_tile);
   value->SetBoolean("has_no_damage", has_no_damage);
 
   // Quad data can be quite large, so only dump render passes if we select
   // cc.debug.quads.
   bool quads_enabled;
   TRACE_EVENT_CATEGORY_GROUP_ENABLED(
       TRACE_DISABLED_BY_DEFAULT("cc.debug.quads"), &quads_enabled);
   if (quads_enabled) {
-    scoped_ptr<base::ListValue> render_pass_list(new base::ListValue());
-    for (size_t i = 0; i < render_passes.size(); ++i)
-      render_pass_list->Append(render_passes[i]->AsValue().release());
-    value->Set("render_passes", render_pass_list.release());
+    value->BeginArray("render_passes");
+    for (size_t i = 0; i < render_passes.size(); ++i) {
+      value->BeginDictionary();
+      render_passes[i]->AsValueInto(value);
+      value->EndDictionary();
+    }
+    value->EndArray();
   }
-  return value.PassAs<base::Value>();
 }
 
 void LayerTreeHostImpl::FrameData::AppendRenderPass(
     scoped_ptr<RenderPass> render_pass) {
   render_passes_by_id[render_pass->id] = render_pass.get();
   render_passes.push_back(render_pass.Pass());
 }
 
 DrawMode LayerTreeHostImpl::GetDrawMode() const {
   if (resourceless_software_draw_) {
@@ skipping 961 matching lines @@
   }
 
   {
     TRACE_EVENT0("cc", "DrawLayers.FrameViewerTracing");
     TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID(
        TRACE_DISABLED_BY_DEFAULT("cc.debug") ","
        TRACE_DISABLED_BY_DEFAULT("cc.debug.quads") ","
        TRACE_DISABLED_BY_DEFAULT("devtools.timeline.layers"),
        "cc::LayerTreeHostImpl",
        id_,
-       TracedValue::FromValue(AsValueWithFrame(frame).release()));
+       AsValueWithFrame(frame));
   }
 
   const DrawMode draw_mode = GetDrawMode();
 
   // Because the contents of the HUD depend on everything else in the frame, the
   // contents of its texture are updated as the last thing before the frame is
   // drawn.
   if (active_tree_->hud_layer()) {
     TRACE_EVENT0("cc", "DrawLayers.UpdateHudTexture");
     active_tree_->hud_layer()->UpdateHudTexture(draw_mode,
@@ skipping 1598 matching lines @@
 
 base::TimeTicks LayerTreeHostImpl::CurrentFrameTimeTicks() {
   // Try to use the current frame time to keep animations non-jittery.  But if
   // we're not in a frame (because this is during an input event or a delayed
   // task), fall back to physical time.  This should still be monotonic.
   if (!current_frame_timeticks_.is_null())
     return current_frame_timeticks_;
   return gfx::FrameTime::Now();
 }
 
-scoped_ptr<base::Value> LayerTreeHostImpl::AsValueWithFrame(
-    FrameData* frame) const {
-  scoped_ptr<base::DictionaryValue> state(new base::DictionaryValue());
-  if (this->pending_tree_)
-      state->Set("activation_state", ActivationStateAsValue().release());
-  state->Set("device_viewport_size",
-             MathUtil::AsValue(device_viewport_size_).release());
-  if (tile_manager_)
-    state->Set("tiles", tile_manager_->AllTilesAsValue().release());
-  state->Set("active_tree", active_tree_->AsValue().release());
-  if (pending_tree_)
-    state->Set("pending_tree", pending_tree_->AsValue().release());
-  if (frame)
-    state->Set("frame", frame->AsValue().release());
-  return state.PassAs<base::Value>();
+scoped_refptr<base::debug::ConvertableToTraceFormat>
+LayerTreeHostImpl::AsValue() const {
+  return AsValueWithFrame(NULL);
 }
 
-scoped_ptr<base::Value> LayerTreeHostImpl::ActivationStateAsValue() const {
-  scoped_ptr<base::DictionaryValue> state(new base::DictionaryValue());
-  state->Set("lthi", TracedValue::CreateIDRef(this).release());
-  if (tile_manager_)
-    state->Set("tile_manager", tile_manager_->BasicStateAsValue().release());
-  return state.PassAs<base::Value>();
+scoped_refptr<base::debug::ConvertableToTraceFormat>
+LayerTreeHostImpl::AsValueWithFrame(FrameData* frame) const {
+  scoped_refptr<base::debug::TracedValue> state =
+      new base::debug::TracedValue();
+  AsValueWithFrameInto(frame, state.get());
+  return state;
+}
+
+void LayerTreeHostImpl::AsValueWithFrameInto(
+    FrameData* frame,
+    base::debug::TracedValue* state) const {
+  if (this->pending_tree_) {
+    state->BeginDictionary("activation_state");
+    ActivationStateAsValueInto(state);
+    state->EndDictionary();
+  }
+  state->BeginDictionary("device_viewport_size");
+  MathUtil::AddToTracedValue(device_viewport_size_, state);
+  state->EndDictionary();
+  if (tile_manager_) {
+    state->BeginArray("tiles");
+    tile_manager_->AllTilesAsValueInto(state);
+    state->EndArray();
+  }
+  state->BeginDictionary("active_tree");
+  active_tree_->AsValueInto(state);
+  state->EndDictionary();
+  if (pending_tree_) {
+    state->BeginDictionary("pending_tree");
+    pending_tree_->AsValueInto(state);
+    state->EndDictionary();
+  }
+  if (frame) {
+    state->BeginDictionary("frame");
+    frame->AsValueInto(state);
+    state->EndDictionary();
+  }
+}
+
+scoped_refptr<base::debug::ConvertableToTraceFormat>
+LayerTreeHostImpl::ActivationStateAsValue() const {
+  scoped_refptr<base::debug::TracedValue> state =
+      new base::debug::TracedValue();
+  ActivationStateAsValueInto(state.get());
+  return state;
+}
+
+void LayerTreeHostImpl::ActivationStateAsValueInto(
+    base::debug::TracedValue* state) const {
+  TracedValue::SetIDRef(this, state, "lthi");
+  if (tile_manager_) {
+    state->BeginDictionary("tile_manager");
+    tile_manager_->BasicStateAsValueInto(state);
+    state->EndDictionary();
+  }
 }
 
 void LayerTreeHostImpl::SetDebugState(
     const LayerTreeDebugState& new_debug_state) {
   if (LayerTreeDebugState::Equal(debug_state_, new_debug_state))
     return;
   if (debug_state_.continuous_painting != new_debug_state.continuous_painting)
     paint_time_counter_->ClearHistory();
 
   debug_state_ = new_debug_state;
@@ skipping 126 matching lines @@
 }
 
 void LayerTreeHostImpl::UnregisterPictureLayerImpl(PictureLayerImpl* layer) {
   std::vector<PictureLayerImpl*>::iterator it =
       std::find(picture_layers_.begin(), picture_layers_.end(), layer);
   DCHECK(it != picture_layers_.end());
   picture_layers_.erase(it);
 }
 
 }  // namespace cc