cc: Make BackToBackBeginFrameSource a SyntheticBeginFrameSource.

content/browser/compositor/browser_compositor_output_surface.cc

Index: content/browser/compositor/browser_compositor_output_surface.cc
diff --git a/content/browser/compositor/browser_compositor_output_surface.cc b/content/browser/compositor/browser_compositor_output_surface.cc
index 66183edd4d410ba9af3b3ff621f29128581b135e..3fa2f9ecc1e74060ce796dc4ccd8692926ad932e 100644
--- a/content/browser/compositor/browser_compositor_output_surface.cc
+++ b/content/browser/compositor/browser_compositor_output_surface.cc
@@ -9,9 +9,11 @@
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/location.h"
+#include "base/memory/ptr_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "cc/base/switches.h"
 #include "cc/output/output_surface_client.h"
+#include "cc/scheduler/delay_based_time_source.h"
 #include "components/display_compositor/compositor_overlay_candidate_validator.h"
 #include "content/browser/compositor/reflector_impl.h"
 #include "content/common/gpu/client/context_provider_command_buffer.h"
@@ -26,9 +28,8 @@ BrowserCompositorOutputSurface::BrowserCompositorOutputSurface(
         overlay_candidate_validator)
     : OutputSurface(std::move(context_provider), nullptr, nullptr),
       vsync_manager_(std::move(vsync_manager)),
-      synthetic_begin_frame_source_(new cc::SyntheticBeginFrameSource(
-          task_runner,
-          cc::BeginFrameArgs::DefaultInterval())),
+      synthetic_begin_frame_source_(new cc::DelayBasedBeginFrameSource(
+          base::MakeUnique<cc::DelayBasedTimeSource>(task_runner))),
       reflector_(nullptr),
       use_begin_frame_scheduling_(
           base::CommandLine::ForCurrentProcess()->HasSwitch(
@@ -43,9 +44,8 @@ BrowserCompositorOutputSurface::BrowserCompositorOutputSurface(
     base::SingleThreadTaskRunner* task_runner)
     : OutputSurface(nullptr, nullptr, std::move(software_device)),
       vsync_manager_(vsync_manager),
-      synthetic_begin_frame_source_(new cc::SyntheticBeginFrameSource(
-          task_runner,
-          cc::BeginFrameArgs::DefaultInterval())),
+      synthetic_begin_frame_source_(new cc::DelayBasedBeginFrameSource(
+          base::MakeUnique<cc::DelayBasedTimeSource>(task_runner))),
       reflector_(nullptr),
       use_begin_frame_scheduling_(
           base::CommandLine::ForCurrentProcess()->HasSwitch(
@@ -59,9 +59,8 @@ BrowserCompositorOutputSurface::BrowserCompositorOutputSurface(
     base::SingleThreadTaskRunner* task_runner)
     : OutputSurface(std::move(vulkan_context_provider)),
       vsync_manager_(vsync_manager),
-      synthetic_begin_frame_source_(new cc::SyntheticBeginFrameSource(
-          task_runner,
-          cc::BeginFrameArgs::DefaultInterval())),
+      synthetic_begin_frame_source_(new cc::DelayBasedBeginFrameSource(
+          base::MakeUnique<cc::DelayBasedTimeSource>(task_runner))),
       reflector_(nullptr) {
   Initialize();
 }