cc: Split out BeginFrame needed verse proactive for commits.

cc/scheduler/scheduler_state_machine_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_state_machine.h"
 
 #include "base/debug/trace_event.h"
 #include "cc/scheduler/scheduler.h"
 #include "cc/test/begin_frame_args_test.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 152 matching lines @@
     EXPECT_FALSE(state.BeginFrameNeeded());
 
     EXPECT_ACTION_UPDATE_STATE(SchedulerStateMachine::ACTION_NONE);
     EXPECT_FALSE(state.BeginFrameNeeded());
     state.OnBeginImplFrame(
         CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE));
     EXPECT_ACTION_UPDATE_STATE(SchedulerStateMachine::ACTION_NONE);
     state.OnBeginImplFrameDeadline();
   }
 
+  // If commit requested but can_draw is false, begin a main frame.
+  {
+    SchedulerSettings scheduler_settings;
+    // This only happens when proactive begin frames are false.
+    scheduler_settings.using_synchronous_renderer_compositor = true;
+    StateMachine state(scheduler_settings);
+    state.SetCanStart();
+    state.SetNeedsRedraw(false);
+    state.SetVisible(true);
+    state.SetNeedsCommit();
+    state.SetCanDraw(false);
+
+    EXPECT_ACTION(SchedulerStateMachine::ACTION_BEGIN_OUTPUT_SURFACE_CREATION);
+    state.UpdateState(state.NextAction());
+    state.DidCreateAndInitializeOutputSurface();
+
+    // Expect nothing to happen until the IMPL frame comes in.
+    EXPECT_COMMIT_STATE(SchedulerStateMachine::COMMIT_STATE_IDLE);
+    EXPECT_IMPL_FRAME_STATE(SchedulerStateMachine::BEGIN_IMPL_FRAME_STATE_IDLE);
+    EXPECT_ACTION(SchedulerStateMachine::ACTION_NONE);
+
+    // Despite not being able to draw, we do need a BeginImplFrame.
+    EXPECT_TRUE(state.BeginFrameNeeded());
+
+    state.OnBeginImplFrame(
+        CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE));
+    EXPECT_ACTION_UPDATE_STATE(
+        SchedulerStateMachine::ACTION_SEND_BEGIN_MAIN_FRAME);
+  }
+
   // If commit requested, begin a main frame.
   {
     StateMachine state(default_scheduler_settings);
     state.SetCommitState(SchedulerStateMachine::COMMIT_STATE_IDLE);
     state.SetCanStart();
     state.UpdateState(state.NextAction());
     state.CreateAndInitializeOutputSurfaceWithActivatedCommit();
     state.SetNeedsRedraw(false);
     state.SetVisible(true);
     state.SetNeedsCommit();
@@ skipping 1741 matching lines @@
   state.SetVisible(true);
   state.SetCanDraw(true);
 
   EXPECT_FALSE(state.BeginFrameNeeded());
   state.SetChildrenNeedBeginFrames(true);
   EXPECT_TRUE(state.BeginFrameNeeded());
 }
 
 }  // namespace
 }  // namespace cc