compositor-worker: Add CompositorProxyClient worker client of CompositorWorker.

third_party/WebKit/Source/web/CompositorProxyClientImpl.cpp

+// Copyright 2015 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 "web/CompositorProxyClientImpl.h"
+
+#include "core/dom/CompositorProxy.h"
+#include "modules/compositorworker/CompositorWorkerGlobalScope.h"
+#include "platform/TraceEvent.h"
+#include "wtf/CurrentTime.h"
+
+namespace blink {
+
+CompositorProxyClientImpl::CompositorProxyClientImpl()
+    : m_globalScope(nullptr)
+{
+}
+
+DEFINE_TRACE(CompositorProxyClientImpl)
+{
+    CompositorProxyClient::trace(visitor);
+    visitor->trace(m_globalScope);
+}
+
+void CompositorProxyClientImpl::setGlobalScope(WorkerGlobalScope* scope)
+{
+    TRACE_EVENT0("compositor-worker", "CompositorProxyClientImpl::setGlobalScope");
+    DCHECK(!m_globalScope);
+    DCHECK(scope);
+    m_globalScope = static_cast<CompositorWorkerGlobalScope*>(scope);
+}
+
+void CompositorProxyClientImpl::runAnimationFrameCallbacks()
+{
+    m_requestedAnimationFrameCallbacks = true;
+    mutate(monotonicallyIncreasingTime());
+}
+
+bool CompositorProxyClientImpl::mutate(double monotonicTimeNow)
+{
+    if (!m_globalScope)
+        return false;
+
+    TRACE_EVENT0("compositor-worker", "CompositorProxyClientImpl::mutate");
+    if (!m_requestedAnimationFrameCallbacks)
+        return false;
+
+    m_requestedAnimationFrameCallbacks = executeAnimationFrameCallbacks(monotonicTimeNow);
+
+    return m_requestedAnimationFrameCallbacks;
+}
+
+bool CompositorProxyClientImpl::executeAnimationFrameCallbacks(double monotonicTimeNow)
+{
+    TRACE_EVENT0("compositor-worker", "CompositorProxyClientImpl::executeAnimationFrameCallbacks");
+    // Convert to zero based document time in milliseconds consistent with requestAnimationFrame.
+    double highResTimeMs = 1000.0 * (monotonicTimeNow - m_globalScope->timeOrigin());
+    const bool shouldReinvoke = m_globalScope->executeAnimationFrameCallbacks(highResTimeMs);
+    return shouldReinvoke;
+}
+
+} // namespace blink