Changing animate to beginFrame and use struct rather than naked double to allow extension.

public/web/WebBeginFrameArgs.h

 /*
  * Copyright (C) 2014 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 10 matching lines @@
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR 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.
  */
 
-#ifndef WebConnectionType_h
-#define WebConnectionType_h
+#ifndef WebBeginFrameArgs_h
+#define WebBeginFrameArgs_h
 
 namespace blink {
 
-// Connection types from http://w3c.github.io/netinfo/.
-enum WebConnectionType {
-    ConnectionTypeCellular = 0,
-    ConnectionTypeBluetooth,
-    ConnectionTypeEthernet,
-    ConnectionTypeWifi,
-    ConnectionTypeOther,
-    ConnectionTypeNone,
-    ConnectionTypeUnknown,
-    ConnectionTypeLast = ConnectionTypeUnknown
+struct WebBeginFrameArgs {
+    WebBeginFrameArgs(double lastFrameTime)
+        : lastFrameTime(lastFrameTime)
+    { }
+
+    // FIXME(mithro): Upgrade the time in CLOCK_MONOTONIC values to use a
+    // TimeTick like class rather than a bare double.
+
+    // Time in CLOCK_MONOTONIC that is the most recent vsync time.
+    double lastFrameTime;
 };
 
 } // namespace blink
 
-#endif // WebConnectionType_h
+#endif