Rename m_currentTask and s_currentTask/ to help rewrite_to_chrome_style tool.

This CL helps rewrite_to_chrome_style tool, by preventing the tool from
suggesting the following conflicting renames:
- |s_field| -> |field_|
- |m_field| -> |field_|

BUG=641004

Review-Url: https://codereview.chromium.org/2569433002
Cr-Commit-Position: refs/heads/master@{#438058}

third_party/WebKit/Source/core/animation/AnimationClock.cpp

@@ -43,16 +43,16 @@ const double approximateFrameTime = 1 / 60.0;
 
 namespace blink {
 
-unsigned AnimationClock::s_currentTask = 0;
+unsigned AnimationClock::s_currentlyRunningTask = 0;
 
 void AnimationClock::updateTime(double time) {
   if (time > m_time)
     m_time = time;
-  m_currentTask = s_currentTask;
+  m_taskForWhichTimeWasCalculated = s_currentlyRunningTask;
 }
 
 double AnimationClock::currentTime() {
-  if (m_currentTask != s_currentTask) {
+  if (m_taskForWhichTimeWasCalculated != s_currentlyRunningTask) {
     const double currentTime = m_monotonicallyIncreasingTime();
     if (m_time < currentTime) {
       // Advance to the first estimated frame after the current time.
@@ -63,7 +63,7 @@ double AnimationClock::currentTime() {
       DCHECK_LE(newTime, currentTime + approximateFrameTime);
       updateTime(newTime);
     } else {
-      m_currentTask = s_currentTask;
+      m_taskForWhichTimeWasCalculated = s_currentlyRunningTask;
     }
   }
   return m_time;
@@ -71,8 +71,8 @@ double AnimationClock::currentTime() {
 
 void AnimationClock::resetTimeForTesting(double time) {
   m_time = time;
-  m_currentTask = 0;
-  s_currentTask = 0;
+  m_taskForWhichTimeWasCalculated = 0;
+  s_currentlyRunningTask = 0;
 }
 
 }  // namespace blink

third_party/WebKit/Source/core/animation/AnimationClock.h

@@ -35,10 +35,14 @@
 #include "wtf/Allocator.h"
 #include "wtf/CurrentTime.h"
 #include "wtf/Noncopyable.h"
+
 #include <limits>
 
 namespace blink {
 
+// Maintains a stationary clock time during script execution.  Tries to track
+// the glass time (the moment photons leave the screen) of the current animation
+// frame.
 class CORE_EXPORT AnimationClock {
   DISALLOW_NEW();
   WTF_MAKE_NONCOPYABLE(AnimationClock);
@@ -48,19 +52,21 @@ class CORE_EXPORT AnimationClock {
                               WTF::monotonicallyIncreasingTime)
       : m_monotonicallyIncreasingTime(monotonicallyIncreasingTime),
         m_time(0),
-        m_currentTask(std::numeric_limits<unsigned>::max()) {}
+        m_taskForWhichTimeWasCalculated(std::numeric_limits<unsigned>::max()) {}
 
   void updateTime(double time);
   double currentTime();
   void resetTimeForTesting(double time = 0);
 
-  static void notifyTaskStart() { ++s_currentTask; }
+  // notifyTaskStart should be called right before the main message loop starts
+  // to run the next task from the message queue.
+  static void notifyTaskStart() { ++s_currentlyRunningTask; }
 
  private:
   WTF::TimeFunction m_monotonicallyIncreasingTime;
   double m_time;
-  unsigned m_currentTask;
-  static unsigned s_currentTask;
+  unsigned m_taskForWhichTimeWasCalculated;
+  static unsigned s_currentlyRunningTask;
 };
 
 }  // namespace blink