HACK: Drop frame rate of Renderer.

cc/scheduler/scheduler.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/scheduler/scheduler.h"
 
 #include <algorithm>
 
 #include "base/auto_reset.h"
 #include "base/logging.h"
@@ skipping 48 matching lines @@
   return scheduler->unthrottled_frame_source_internal_.get();
 }
 
 Scheduler::Scheduler(
     SchedulerClient* client,
     const SchedulerSettings& scheduler_settings,
     int layer_tree_host_id,
     const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
     scoped_ptr<BeginFrameSource> external_begin_frame_source,
     SchedulerFrameSourcesConstructor* frame_sources_constructor)
-    : frame_source_(),
+    : begin_frame_count_(0),
+      frame_source_(),
       primary_frame_source_(NULL),
       primary_frame_source_internal_(external_begin_frame_source.Pass()),
       vsync_observer_(NULL),
       authoritative_vsync_interval_(base::TimeDelta()),
       last_vsync_timebase_(base::TimeTicks()),
       throttle_frame_production_(false),
       settings_(scheduler_settings),
       client_(client),
       layer_tree_host_id_(layer_tree_host_id),
       task_runner_(task_runner),
@@ skipping 253 matching lines @@
   }
 }
 
 // BeginFrame is the mechanism that tells us that now is a good time to start
 // making a frame. Usually this means that user input for the frame is complete.
 // If the scheduler is busy, we queue the BeginFrame to be handled later as
 // a BeginRetroFrame.
 bool Scheduler::OnBeginFrameMixInDelegate(const BeginFrameArgs& args) {
   TRACE_EVENT1("cc,benchmark", "Scheduler::BeginFrame", "args", args.AsValue());
 
+  bool in_renderer = !settings_.main_thread_should_always_be_low_latency;
+  if (in_renderer) {
+    const int kFramesToSkip = 1;
+    begin_frame_count_++;
+    if (begin_frame_count_ <= kFramesToSkip)
+      return false;
+    begin_frame_count_ = 0;
+  }
+
   // Deliver BeginFrames to children.
   if (state_machine_.children_need_begin_frames()) {
     BeginFrameArgs adjusted_args_for_children(args);
     // Adjust a deadline for child schedulers.
     // TODO(simonhong): Once we have commitless update, we can get rid of
     // BeginMainFrameToCommitDurationEstimate() +
     // CommitToActivateDurationEstimate().
     adjusted_args_for_children.deadline -=
         (client_->BeginMainFrameToCommitDurationEstimate() +
          client_->CommitToActivateDurationEstimate() +
@@ skipping 477 matching lines @@
 }
 
 bool Scheduler::IsBeginMainFrameSentOrStarted() const {
   return (state_machine_.commit_state() ==
               SchedulerStateMachine::COMMIT_STATE_BEGIN_MAIN_FRAME_SENT ||
           state_machine_.commit_state() ==
               SchedulerStateMachine::COMMIT_STATE_BEGIN_MAIN_FRAME_STARTED);
 }
 
 }  // namespace cc