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

src/images/SkImageDecoder_libwebp.cpp

 /*
  * Copyright 2010, The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
@@ skipping 113 matching lines @@
 
     typedef SkImageDecoder INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////
 
 #ifdef TIME_DECODE
 
 #include "SkTime.h"
 
-class AutoTimeMillis {
-public:
-    AutoTimeMillis(const char label[]) :
-        fLabel(label) {
-        if (nullptr == fLabel) {
-            fLabel = "";
-        }
-        fNow = SkTime::GetMSecs();
-    }
-    ~AutoTimeMillis() {
-        SkDebugf("---- Time (ms): %s %d\n", fLabel, SkTime::GetMSecs() - fNow);
-    }
-private:
-    const char* fLabel;
-    SkMSec fNow;
-};
-
 #endif
 
 ///////////////////////////////////////////////////////////////////////////////
 
 // This guy exists just to aid in debugging, as it allows debuggers to just
 // set a break-point in one place to see all error exists.
 static void print_webp_error(const SkBitmap& bm, const char msg[]) {
     SkDEBUGF(("libwebp error %s [%d %d]", msg, bm.width(), bm.height()));
 }
 
@@ skipping 118 matching lines @@
         } else {
             alphaType = kPremul_SkAlphaType;
         }
     }
     return decodedBitmap->setInfo(SkImageInfo::Make(width, height, colorType, alphaType));
 }
 
 SkImageDecoder::Result SkWEBPImageDecoder::onDecode(SkStream* stream, SkBitmap* decodedBitmap,
                                                     Mode mode) {
 #ifdef TIME_DECODE
-    AutoTimeMillis atm("WEBP Decode");
+    SkAutoTime atm("WEBP Decode");
 #endif
 
     int origWidth, origHeight, hasAlpha;
     if (!webp_parse_header(stream, &origWidth, &origHeight, &hasAlpha)) {
         return kFailure;
     }
     this->fHasAlpha = hasAlpha;
 
     const int sampleSize = this->getSampleSize();
     SkScaledBitmapSampler sampler(origWidth, origHeight, sampleSize);
@@ skipping 250 matching lines @@
     return SkImageDecoder::kUnknown_Format;
 }
 
 static SkImageEncoder* sk_libwebp_efactory(SkImageEncoder::Type t) {
     return (SkImageEncoder::kWEBP_Type == t) ? new SkWEBPImageEncoder : nullptr;
 }
 
 static SkImageDecoder_DecodeReg gDReg(sk_libwebp_dfactory);
 static SkImageDecoder_FormatReg gFormatReg(get_format_webp);
 static SkImageEncoder_EncodeReg gEReg(sk_libwebp_efactory);