Change SkTime::GetMSecs to double; ensure values stored in SkMSec do not overflow.

include/views/SkEvent.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkEvent_DEFINED
 #define SkEvent_DEFINED
 
@@ skipping 188 matching lines @@
      *  the specifed millisecond delay.
      *
      *  The event must be dynamically allocated, as ownership is transferred to
      *  the event queue. It cannot be allocated on the stack or in a global.
      */
     void postDelay(SkMSec delay);
 
     /**
      *  Post to the event queue using the event's targetID or target-proc.
      *  The event will be delivered no sooner than the specified millisecond
-     *  time, as measured by SkTime::GetMSecs().
+     *  time, as measured by GetMSecsSinceStartup().
      *
      *  The event must be dynamically allocated, as ownership is transferred to
      *  the event queue. It cannot be allocated on the stack or in a global.
      */
     void postTime(SkMSec time);
 
+    /**
+     *  Returns ~zero the first time it's called, then returns the number of
+     *  milliseconds since the first call. Behavior is undefined if the program
+     *  runs more than ~25 days.
+     */
+    static SkMSec GetMSecsSinceStartup();
+
     ///////////////////////////////////////////////
     /** Porting layer must call these functions **/
     ///////////////////////////////////////////////
 
     /** Global initialization function for the SkEvent system. Should be called exactly
         once before any other event method is called, and should be called after the
         call to SkGraphics::Init().
     */
     static void Init();
     /** Global cleanup function for the SkEvent system. Should be called exactly once after
@@ skipping 49 matching lines @@
 
     void initialize(const char* type, size_t typeLen, SkEventSinkID);
 
     static bool Enqueue(SkEvent* evt);
     static SkMSec EnqueueTime(SkEvent* evt, SkMSec time);
     static SkEvent* Dequeue();
     static bool     QHasEvents();
 };
 
 #endif