Added ability to dynamically toggle frame throttling in the scheduler.

In order to allow Vsync to be toggled by dev tools we need to both set the swap
interval to 0 on systems that support it and prevent the scheduler from
throttling frames.

BUG=437172

Review URL: https://codereview.chromium.org/811523002

Cr-Commit-Position: refs/heads/master@{#310139}

1 files changed, 14 insertions, 11 deletions

diff --git a/cc/test/scheduler_test_common.cc b/cc/test/scheduler_test_common.cc
index 61ef0cf..03e65ab 100644
--- a/cc/test/scheduler_test_common.cc
+++ b/cc/test/scheduler_test_common.cc
@@ -74,17 +74,7 @@ TestSchedulerFrameSourcesConstructor::~TestSchedulerFrameSourcesConstructor() {
 BeginFrameSource*
 TestSchedulerFrameSourcesConstructor::ConstructPrimaryFrameSource(
     Scheduler* scheduler) {
-  if (!scheduler->settings_.throttle_frame_production) {
-    TRACE_EVENT1(
-        "cc",
-        "TestSchedulerFrameSourcesConstructor::ConstructPrimaryFrameSource",
-        "source",
-        "TestBackToBackBeginFrameSource");
-    DCHECK(!scheduler->primary_frame_source_internal_);
-    scheduler->primary_frame_source_internal_ =
-        TestBackToBackBeginFrameSource::Create(now_src_, test_task_runner_);
-    return scheduler->primary_frame_source_internal_.get();
-  } else if (scheduler->settings_.use_external_begin_frame_source) {
+  if (scheduler->settings_.use_external_begin_frame_source) {
     return SchedulerFrameSourcesConstructor::ConstructPrimaryFrameSource(
         scheduler);
   } else {
@@ -121,6 +111,19 @@ TestSchedulerFrameSourcesConstructor::ConstructBackgroundFrameSource(
   return scheduler->background_frame_source_internal_.get();
 }
 
+BeginFrameSource*
+TestSchedulerFrameSourcesConstructor::ConstructUnthrottledFrameSource(
+    Scheduler* scheduler) {
+  TRACE_EVENT1(
+      "cc",
+      "TestSchedulerFrameSourcesConstructor::ConstructUnthrottledFrameSource",
+      "source", "TestBackToBackBeginFrameSource");
+  DCHECK(!scheduler->unthrottled_frame_source_internal_);
+  scheduler->unthrottled_frame_source_internal_ =
+      TestBackToBackBeginFrameSource::Create(now_src_, test_task_runner_);
+  return scheduler->unthrottled_frame_source_internal_.get();
+}
+
 TestScheduler::TestScheduler(
     scoped_refptr<TestNowSource> now_src,
     SchedulerClient* client,