cc: Allow SendBeginMainFrame in idle state for synchronous compositor.

cc/scheduler/scheduler_unittest.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 <string>
 #include <vector>
 
 #include "base/logging.h"
@@ skipping 3361 matching lines @@
   // Next vsync.
   EXPECT_SCOPED(AdvanceFrame());
   EXPECT_FALSE(scheduler_->PrepareTilesPending());
   EXPECT_ACTION("WillBeginImplFrame", client_, 0, 3);
   EXPECT_ACTION("SetNeedsBeginFrames(false)", client_, 1, 3);
   EXPECT_ACTION("SendBeginMainFrameNotExpectedSoon", client_, 2, 3);
   EXPECT_FALSE(client_->needs_begin_frames());
   client_->Reset();
 }
 
+TEST_F(SchedulerTest, SynchronousCompositorSendBeginMainFrameWhileIdle) {
+  scheduler_settings_.using_synchronous_renderer_compositor = true;
+  scheduler_settings_.use_external_begin_frame_source = true;
+
+  SetUpScheduler(true);
+
+  scheduler_->SetNeedsRedraw();
+  EXPECT_SINGLE_ACTION("SetNeedsBeginFrames(true)", client_);
+  client_->Reset();
+
+  // Next vsync.
+  EXPECT_SCOPED(AdvanceFrame());
+  EXPECT_ACTION("WillBeginImplFrame", client_, 0, 3);
+  EXPECT_ACTION("ScheduledActionAnimate", client_, 1, 3);
+  EXPECT_ACTION("ScheduledActionInvalidateOutputSurface", client_, 2, 3);
+  client_->Reset();
+
+  // Android onDraw.
+  scheduler_->SetNeedsRedraw();
+  scheduler_->OnDrawForOutputSurface();
+  EXPECT_SINGLE_ACTION("ScheduledActionDrawAndSwapIfPossible", client_);
+  EXPECT_FALSE(scheduler_->BeginImplFrameDeadlinePending());
+  EXPECT_FALSE(scheduler_->PrepareTilesPending());
+  client_->Reset();
+
+  // Simulate SetNeedsCommit due to input event.
+  scheduler_->SetNeedsCommit();
+  EXPECT_SINGLE_ACTION("ScheduledActionSendBeginMainFrame", client_);
+  client_->Reset();
+
+  scheduler_->NotifyBeginMainFrameStarted();
+  scheduler_->NotifyReadyToCommit();
+  EXPECT_SINGLE_ACTION("ScheduledActionCommit", client_);
+  client_->Reset();
+
+  scheduler_->NotifyReadyToActivate();
+  EXPECT_SINGLE_ACTION("ScheduledActionActivateSyncTree", client_);
+  client_->Reset();
+
+  // Next vsync.
+  EXPECT_SCOPED(AdvanceFrame());
+  EXPECT_ACTION("WillBeginImplFrame", client_, 0, 3);
+  EXPECT_ACTION("ScheduledActionAnimate", client_, 1, 3);
+  EXPECT_ACTION("ScheduledActionInvalidateOutputSurface", client_, 2, 3);
+  client_->Reset();
+
+  // Android onDraw.
+  scheduler_->SetNeedsRedraw();
+  scheduler_->OnDrawForOutputSurface();
+  EXPECT_SINGLE_ACTION("ScheduledActionDrawAndSwapIfPossible", client_);
+  EXPECT_FALSE(scheduler_->BeginImplFrameDeadlinePending());
+  EXPECT_FALSE(scheduler_->PrepareTilesPending());
+  client_->Reset();
+
+  // Simulate SetNeedsCommit due to input event.
+  scheduler_->SetNeedsCommit();
+  EXPECT_SINGLE_ACTION("ScheduledActionSendBeginMainFrame", client_);
+  client_->Reset();
+}
+
 TEST_F(SchedulerTest, AuthoritativeVSyncInterval) {
   SetUpScheduler(true);
   base::TimeDelta initial_interval = scheduler_->BeginImplFrameInterval();
   base::TimeDelta authoritative_interval =
       base::TimeDelta::FromMilliseconds(33);
 
   scheduler_->SetNeedsCommit();
   EXPECT_SCOPED(AdvanceFrame());
 
   EXPECT_EQ(initial_interval, scheduler_->BeginImplFrameInterval());
@@ skipping 41 matching lines @@
   scheduler_->SetImplLatencyTakesPriority(true);
   scheduler_->SetChildrenNeedBeginFrames(true);
 
   EXPECT_SCOPED(AdvanceFrame());
   EXPECT_TRUE(client_->begin_frame_is_sent_to_children());
   EXPECT_FALSE(client_->begin_frame_args_sent_to_children().on_critical_path);
 }
 
 }  // namespace
 }  // namespace cc