Initial import attempt, just to play with. Many things disabled/removed

ui/cc/cc/CCFrameRateController.cpp

Index: ui/cc/cc/CCFrameRateController.cpp
diff --git a/ui/cc/cc/CCFrameRateController.cpp b/ui/cc/cc/CCFrameRateController.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..df7f31554a1feef2d875d1ef7e1e72e2589ea878
--- /dev/null
+++ b/ui/cc/cc/CCFrameRateController.cpp
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2011 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#include "cc/CCFrameRateController.h"
+
+#include "TraceEvent.h"
+#include "cc/CCTimeSource.h"
+
+namespace WebCore {
+
+class CCFrameRateControllerTimeSourceAdapter : public CCTimeSourceClient {
+public:
+    static PassOwnPtr<CCFrameRateControllerTimeSourceAdapter> create(CCFrameRateController* frameRateController)
+    {
+        return adoptPtr(new CCFrameRateControllerTimeSourceAdapter(frameRateController));
+    }
+    virtual ~CCFrameRateControllerTimeSourceAdapter() { }
+
+    virtual void onTimerTick() OVERRIDE { m_frameRateController->onTimerTick(); }
+private:
+    explicit CCFrameRateControllerTimeSourceAdapter(CCFrameRateController* frameRateController)
+            : m_frameRateController(frameRateController) { }
+
+    CCFrameRateController* m_frameRateController;
+};
+
+CCFrameRateController::CCFrameRateController(PassRefPtr<CCTimeSource> timer)
+    : m_client(0)
+    , m_numFramesPending(0)
+    , m_maxFramesPending(0)
+    , m_timeSource(timer)
+{
+    m_timeSourceClientAdapter = CCFrameRateControllerTimeSourceAdapter::create(this);
+    m_timeSource->setClient(m_timeSourceClientAdapter.get());
+}
+
+CCFrameRateController::~CCFrameRateController()
+{
+    m_timeSource->setActive(false);
+}
+
+void CCFrameRateController::setActive(bool active)
+{
+    if (m_timeSource->active() == active)
+        return;
+    TRACE_EVENT1("cc", "CCFrameRateController::setActive", "active", active);
+    m_timeSource->setActive(active);
+}
+
+void CCFrameRateController::setMaxFramesPending(int maxFramesPending)
+{
+    m_maxFramesPending = maxFramesPending;
+}
+
+void CCFrameRateController::onTimerTick()
+{
+    ASSERT(m_timeSource->active());
+
+    // Don't forward the tick if we have too many frames in flight.
+    if (m_maxFramesPending && m_numFramesPending >= m_maxFramesPending) {
+        TRACE_EVENT0("cc", "CCFrameRateController::onTimerTickButMaxFramesPending");
+        return;
+    }
+
+    if (m_client)
+        m_client->vsyncTick();
+}
+
+void CCFrameRateController::didBeginFrame()
+{
+    m_numFramesPending++;
+}
+
+void CCFrameRateController::didFinishFrame()
+{
+    m_numFramesPending--;
+}
+
+void CCFrameRateController::didAbortAllPendingFrames()
+{
+    m_numFramesPending = 0;
+}
+
+}