cc: Make PrepareToDraw return an enum for why it aborts

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"
 #include "base/memory/scoped_vector.h"
@@ skipping 92 matching lines @@
   virtual void ScheduledActionSendBeginMainFrame() OVERRIDE {
     actions_.push_back("ScheduledActionSendBeginMainFrame");
     states_.push_back(scheduler_->StateAsValue().release());
   }
   virtual DrawSwapReadbackResult ScheduledActionDrawAndSwapIfPossible()
       OVERRIDE {
     actions_.push_back("ScheduledActionDrawAndSwapIfPossible");
     states_.push_back(scheduler_->StateAsValue().release());
     num_draws_++;
     bool did_readback = false;
+    DrawSwapReadbackResult::DrawResult result =
+        draw_will_happen_
+            ? DrawSwapReadbackResult::DRAW_SUCCESS
+            : DrawSwapReadbackResult::DRAW_ABORTED_CHECKERBOARD_ANIMATIONS;
     return DrawSwapReadbackResult(
-        draw_will_happen_,
+        result,
         draw_will_happen_ && swap_will_happen_if_draw_happens_,
         did_readback);
   }
   virtual DrawSwapReadbackResult ScheduledActionDrawAndSwapForced() OVERRIDE {
     actions_.push_back("ScheduledActionDrawAndSwapForced");
     states_.push_back(scheduler_->StateAsValue().release());
-    bool did_draw = true;
     bool did_swap = swap_will_happen_if_draw_happens_;
     bool did_readback = false;
-    return DrawSwapReadbackResult(did_draw, did_swap, did_readback);
+    return DrawSwapReadbackResult(
+        DrawSwapReadbackResult::DRAW_SUCCESS, did_swap, did_readback);
   }
   virtual DrawSwapReadbackResult ScheduledActionDrawAndReadback() OVERRIDE {
     actions_.push_back("ScheduledActionDrawAndReadback");
     states_.push_back(scheduler_->StateAsValue().release());
-    bool did_draw = true;
     bool did_swap = false;
     bool did_readback = true;
-    return DrawSwapReadbackResult(did_draw, did_swap, did_readback);
+    return DrawSwapReadbackResult(
+        DrawSwapReadbackResult::DRAW_SUCCESS, did_swap, did_readback);
   }
   virtual void ScheduledActionCommit() OVERRIDE {
     actions_.push_back("ScheduledActionCommit");
     states_.push_back(scheduler_->StateAsValue().release());
   }
   virtual void ScheduledActionUpdateVisibleTiles() OVERRIDE {
     actions_.push_back("ScheduledActionUpdateVisibleTiles");
     states_.push_back(scheduler_->StateAsValue().release());
   }
   virtual void ScheduledActionActivatePendingTree() OVERRIDE {
@@ skipping 539 matching lines @@
   virtual DrawSwapReadbackResult ScheduledActionDrawAndSwapIfPossible()
       OVERRIDE {
     // Only SetNeedsRedraw the first time this is called
     if (!num_draws_)
       scheduler_->SetNeedsRedraw();
     return FakeSchedulerClient::ScheduledActionDrawAndSwapIfPossible();
   }
 
   virtual DrawSwapReadbackResult ScheduledActionDrawAndSwapForced() OVERRIDE {
     NOTREACHED();
-    bool did_draw = true;
     bool did_swap = true;
     bool did_readback = false;
-    return DrawSwapReadbackResult(did_draw, did_swap, did_readback);
+    return DrawSwapReadbackResult(
+        DrawSwapReadbackResult::DRAW_SUCCESS, did_swap, did_readback);
   }
 
   virtual void ScheduledActionCommit() OVERRIDE {}
   virtual void ScheduledActionBeginOutputSurfaceCreation() OVERRIDE {}
   virtual void DidAnticipatedDrawTimeChange(base::TimeTicks) OVERRIDE {}
 };
 
 // Tests for two different situations:
 // 1. the scheduler dropping SetNeedsRedraw requests that happen inside
 //    a ScheduledActionDrawAndSwap
@@ skipping 92 matching lines @@
     // Only SetNeedsCommit the first time this is called
     if (set_needs_commit_on_next_draw_) {
       scheduler_->SetNeedsCommit();
       set_needs_commit_on_next_draw_ = false;
     }
     return FakeSchedulerClient::ScheduledActionDrawAndSwapIfPossible();
   }
 
   virtual DrawSwapReadbackResult ScheduledActionDrawAndSwapForced() OVERRIDE {
     NOTREACHED();
-    bool did_draw = true;
     bool did_swap = false;
     bool did_readback = false;
-    return DrawSwapReadbackResult(did_draw, did_swap, did_readback);
+    return DrawSwapReadbackResult(
+        DrawSwapReadbackResult::DRAW_SUCCESS, did_swap, did_readback);
   }
 
   virtual void ScheduledActionCommit() OVERRIDE {}
   virtual void ScheduledActionBeginOutputSurfaceCreation() OVERRIDE {}
   virtual void DidAnticipatedDrawTimeChange(base::TimeTicks) OVERRIDE {}
 
   void SetNeedsCommitOnNextDraw() { set_needs_commit_on_next_draw_ = true; }
 
  private:
   bool set_needs_commit_on_next_draw_;
@@ skipping 512 matching lines @@
     SpinForMillis(interval * 2);
     EXPECT_GT(client.num_actions_(), actions_so_far);
     EXPECT_STREQ(client.Action(client.num_actions_() - 1),
                  "DidAnticipatedDrawTimeChange");
     actions_so_far = client.num_actions_();
   }
 }
 
 }  // namespace
 }  // namespace cc