Move default begin frame sources out to mus

ui/compositor/compositor.cc

 // Copyright (c) 2012 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 "ui/compositor/compositor.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <deque>
@@ skipping 27 matching lines @@
 #include "ui/compositor/dip_util.h"
 #include "ui/compositor/layer.h"
 #include "ui/compositor/layer_animator_collection.h"
 #include "ui/gl/gl_switches.h"
 
 namespace {
 
 const double kDefaultRefreshRate = 60.0;
 const double kTestRefreshRate = 200.0;
 
-bool IsRunningInMojoShell(base::CommandLine* command_line) {
-  const char kMojoShellFlag[] = "mojo-platform-channel-handle";
-  return command_line->HasSwitch(kMojoShellFlag);
-}
-
 }  // namespace
 
 namespace ui {
 
 CompositorLock::CompositorLock(Compositor* compositor)
     : compositor_(compositor) {
   if (compositor_->locks_will_time_out_) {
     compositor_->task_runner_->PostDelayedTask(
         FROM_HERE,
         base::Bind(&CompositorLock::CancelLock, AsWeakPtr()),
@@ skipping 118 matching lines @@
       settings.renderer_settings.buffer_to_texture_target_map.insert(
           cc::BufferToTextureTargetMap::value_type(
               cc::BufferToTextureTargetKey(usage, format), target));
     }
   }
 
   // Note: Only enable image decode tasks if we have more than one worker
   // thread.
   settings.image_decode_tasks_enabled = false;
 
-  // TODO(crbug.com/603600): This should always be turned on once mus tells its
-  // clients about BeginFrame.
-  settings.use_output_surface_begin_frame_source =
-      !IsRunningInMojoShell(command_line);
+  settings.use_output_surface_begin_frame_source = true;
 
 #if !defined(OS_ANDROID)
   // TODO(sohanjg): Revisit this memory usage in tile manager.
   cc::ManagedMemoryPolicy policy(
       512 * 1024 * 1024, gpu::MemoryAllocation::CUTOFF_ALLOW_NICE_TO_HAVE,
       settings.memory_policy_.num_resources_limit);
   settings.memory_policy_ = policy;
 #endif
 
   base::TimeTicks before_create = base::TimeTicks::Now();
@@ skipping 383 matching lines @@
                     observer_list_,
                     OnCompositingLockStateChanged(this));
 }
 
 void Compositor::CancelCompositorLock() {
   if (compositor_lock_)
     compositor_lock_->CancelLock();
 }
 
 }  // namespace ui