Making BeginFrameArgs work with TRACE_EVENT system.

 * Added ToValue() method on BeginFrameArgs.
 * Added a ToTrace method inside cc/traced_value.h for easy conversion, just do a ToTrace(XXX) of anything which has a ToValue() method.
 * Rename Scheduler::StateAsValue to AsValue so it works with above.

BUG=371223

Review URL: https://codereview.chromium.org/270703004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269487 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 13 insertions, 0 deletions

diff --git a/cc/output/begin_frame_args.cc b/cc/output/begin_frame_args.cc
index 9766b626..2d7cd96 100644
--- a/cc/output/begin_frame_args.cc
+++ b/cc/output/begin_frame_args.cc
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "base/json/json_writer.h"
 #include "cc/output/begin_frame_args.h"
 #include "ui/gfx/frame_time.h"
 
@@ -27,6 +28,15 @@ BeginFrameArgs BeginFrameArgs::Create(base::TimeTicks frame_time,
   return BeginFrameArgs(frame_time, deadline, interval);
 }
 
+scoped_ptr<base::Value> BeginFrameArgs::AsValue() const {
+  scoped_ptr<base::DictionaryValue> state(new base::DictionaryValue);
+  state->SetString("type", "BeginFrameArgs");
+  state->SetDouble("frame_time_us", frame_time.ToInternalValue());
+  state->SetDouble("deadline_us", deadline.ToInternalValue());
+  state->SetDouble("interval_us", interval.InMicroseconds());
+  return state.PassAs<base::Value>();
+}
+
 BeginFrameArgs BeginFrameArgs::CreateForSynchronousCompositor() {
   // For WebView/SynchronousCompositor, we always want to draw immediately,
   // so we set the deadline to 0 and guess that the interval is 16 milliseconds.
diff --git a/cc/output/begin_frame_args.h b/cc/output/begin_frame_args.h
index 2332fd4..4bc352b 100644
--- a/cc/output/begin_frame_args.h
+++ b/cc/output/begin_frame_args.h
@@ -6,6 +6,7 @@
 #define CC_OUTPUT_BEGIN_FRAME_ARGS_H_
 
 #include "base/time/time.h"
+#include "base/values.h"
 #include "cc/base/cc_export.h"
 
 namespace cc {
@@ -37,6 +38,8 @@ struct CC_EXPORT BeginFrameArgs {
 
   bool IsValid() const { return interval >= base::TimeDelta(); }
 
+  scoped_ptr<base::Value> AsValue() const;
+
   base::TimeTicks frame_time;
   base::TimeTicks deadline;
   base::TimeDelta interval;