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

src/views/SkTouchGesture.cpp

Index: src/views/SkTouchGesture.cpp
diff --git a/src/views/SkTouchGesture.cpp b/src/views/SkTouchGesture.cpp
index 22c9434216bfae9fb781c7bf8d267acaf6523422..676f8e9a64b33e67ed4c034fba9e0bea59597e73 100644
--- a/src/views/SkTouchGesture.cpp
+++ b/src/views/SkTouchGesture.cpp
@@ -115,7 +115,7 @@ void SkTouchGesture::reset() {
     fLocalM.reset();
     fGlobalM.reset();
 
-    fLastUpT = SkTime::GetMSecs() - 2*MAX_DBL_TAP_INTERVAL;
+    fLastUpMillis = SkTime::GetMSecs() - 2*MAX_DBL_TAP_INTERVAL;
     fLastUpP.set(0, 0);
 }
 
@@ -138,7 +138,7 @@ void SkTouchGesture::appendNewRec(void* owner, float x, float y) {
     rec->fOwner = owner;
     rec->fStartX = rec->fPrevX = rec->fLastX = x;
     rec->fStartY = rec->fPrevY = rec->fLastY = y;
-    rec->fLastT = rec->fPrevT = SkTime::GetMSecs();
+    rec->fLastT = rec->fPrevT = static_cast<float>(SkTime::GetSecs());
 }
 
 void SkTouchGesture::touchBegin(void* owner, float x, float y) {
@@ -227,7 +227,8 @@ void SkTouchGesture::touchMoved(void* owner, float x, float y) {
 
     rec.fPrevX = rec.fLastX; rec.fLastX = x;
     rec.fPrevY = rec.fLastY; rec.fLastY = y;
-    rec.fPrevT = rec.fLastT; rec.fLastT = SkTime::GetMSecs();
+    rec.fPrevT = rec.fLastT;
+    rec.fLastT = static_cast<float>(SkTime::GetSecs());
 
     switch (fTouches.count()) {
         case 1: {
@@ -276,7 +277,7 @@ void SkTouchGesture::touchEnd(void* owner) {
             this->flushLocalM();
             float dx = rec.fLastX - rec.fPrevX;
             float dy = rec.fLastY - rec.fPrevY;
-            float dur = (rec.fLastT - rec.fPrevT) * 0.001f;
+            float dur = rec.fLastT - rec.fPrevT;
             if (dur > 0) {
                 fFlinger.reset(dx / dur, dy / dur);
             }
@@ -310,8 +311,8 @@ float SkTouchGesture::computePinch(const Rec& rec0, const Rec& rec1) {
 
 bool SkTouchGesture::handleDblTap(float x, float y) {
     bool found = false;
-    SkMSec now = SkTime::GetMSecs();
-    if (now - fLastUpT <= MAX_DBL_TAP_INTERVAL) {
+    double now = SkTime::GetMSecs();
+    if (now - fLastUpMillis <= MAX_DBL_TAP_INTERVAL) {
         if (SkPoint::Length(fLastUpP.fX - x,
                             fLastUpP.fY - y) <= MAX_DBL_TAP_DISTANCE) {
             fFlinger.stop();
@@ -323,7 +324,7 @@ bool SkTouchGesture::handleDblTap(float x, float y) {
         }
     }
 
-    fLastUpT = now;
+    fLastUpMillis = now;
     fLastUpP.set(x, y);
     return found;
 }