Make RenderViewImpl::OnForceRedraw more robust

cc/output/forced_redraw_swap_promise.h

+// Copyright 2016 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.
+
+#ifndef CC_OUTPUT_FORCED_REDRAW_SWAP_PROMISE_H_
+#define CC_OUTPUT_FORCED_REDRAW_SWAP_PROMISE_H_
+
+#include "base/compiler_specific.h"
+#include "cc/output/swap_promise.h"
+#include "ui/events/latency_info.h"
+
+namespace cc {
+
+// This class represents promise which is robust to (will not be broken by)
+// |DidNotSwapReason::SWAP_FAILS| events.
+class CC_EXPORT ForcedRedrawSwapPromise : public SwapPromise {

[danakj, 2016/08/10 01:04:15]

nit: i prefer AlwaysDrawSwapPromise. "Forced draws" are actually a term for a
specific unrelated thing in cc.

[svartmetal, 2016/08/10 17:38:21]

Fixed.

+ public:
+  explicit ForcedRedrawSwapPromise(const ui::LatencyInfo& latency_info);
+  ~ForcedRedrawSwapPromise() override;
+
+  void DidActivate() override {}
+  void DidSwap(CompositorFrameMetadata* metadata) override;
+  DidNotSwapAction DidNotSwap(DidNotSwapReason reason) override;
+  void OnCommit() override {}
+
+  int64_t TraceId() const override;
+
+ private:
+  ui::LatencyInfo latency_;
+};
+
+}  // namespace cc
+
+#endif  // CC_OUTPUT_FORCED_REDRAW_SWAP_PROMISE_H_