Switch to using TimeTicks for profiling and histograms

Avoid using wall clock time, which can be changed by the user,
or impacted by Daylight Savings transitions etc.

BUG=14193
r=eroman
Review URL: http://codereview.chromium.org/1253005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@46821 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 11 insertions, 11 deletions

diff --git a/chrome/browser/safe_browsing/safe_browsing_database.cc b/chrome/browser/safe_browsing/safe_browsing_database.cc
index aa6a97a..3237b30 100644
--- a/chrome/browser/safe_browsing/safe_browsing_database.cc
+++ b/chrome/browser/safe_browsing/safe_browsing_database.cc
@@ -9,7 +9,7 @@
 #include "chrome/browser/safe_browsing/bloom_filter.h"
 #include "chrome/browser/safe_browsing/safe_browsing_database_bloom.h"
 
-using base::Time;
+using base::TimeTicks;
 
 // Filename suffix for the bloom filter.
 static const FilePath::CharType kBloomFilterFile[] =
@@ -47,10 +47,10 @@ void SafeBrowsingDatabase::LoadBloomFilter() {
   }
 
   // We have a bloom filter file, so use that as our filter.
-  Time before = Time::Now();
+  TimeTicks before = TimeTicks::Now();
   bloom_filter_ = BloomFilter::LoadFile(bloom_filter_filename_);
   SB_DLOG(INFO) << "SafeBrowsingDatabase read bloom filter in "
-                << (Time::Now() - before).InMilliseconds() << " ms";
+                << (TimeTicks::Now() - before).InMilliseconds() << " ms";
 
   if (!bloom_filter_.get())
     UMA_HISTOGRAM_COUNTS("SB2.FilterReadFail", 1);
@@ -64,10 +64,10 @@ void SafeBrowsingDatabase::WriteBloomFilter() {
   if (!bloom_filter_.get())
     return;
 
-  Time before = Time::Now();
+  TimeTicks before = TimeTicks::Now();
   bool write_ok = bloom_filter_->WriteFile(bloom_filter_filename_);
   SB_DLOG(INFO) << "SafeBrowsingDatabase wrote bloom filter in " <<
-      (Time::Now() - before).InMilliseconds() << " ms";
+      (TimeTicks::Now() - before).InMilliseconds() << " ms";
 
   if (!write_ok)
     UMA_HISTOGRAM_COUNTS("SB2.FilterWriteFail", 1);
diff --git a/chrome/browser/safe_browsing/safe_browsing_database_bloom.cc b/chrome/browser/safe_browsing/safe_browsing_database_bloom.cc
index 6951e41..8acda7c 100644
--- a/chrome/browser/safe_browsing/safe_browsing_database_bloom.cc
+++ b/chrome/browser/safe_browsing/safe_browsing_database_bloom.cc
@@ -157,7 +157,7 @@ void SafeBrowsingDatabaseBloom::InsertChunks(const std::string& list_name,
   if (chunks.empty())
     return;
 
-  base::Time insert_start = base::Time::Now();
+  base::TimeTicks insert_start = base::TimeTicks::Now();
 
   int list_id = safe_browsing_util::GetListId(list_name);
   ChunkType chunk_type = chunks.front().is_add ? ADD_CHUNK : SUB_CHUNK;
@@ -190,7 +190,7 @@ void SafeBrowsingDatabaseBloom::InsertChunks(const std::string& list_name,
     }
   }
 
-  UMA_HISTOGRAM_TIMES("SB2.ChunkInsert", base::Time::Now() - insert_start);
+  UMA_HISTOGRAM_TIMES("SB2.ChunkInsert", base::TimeTicks::Now() - insert_start);
 }
 
 void SafeBrowsingDatabaseBloom::DeleteChunks(
diff --git a/chrome/test/chrome_process_util.cc b/chrome/test/chrome_process_util.cc
index 8e86e60..a3c4d6f 100644
--- a/chrome/test/chrome_process_util.cc
+++ b/chrome/test/chrome_process_util.cc
@@ -12,8 +12,8 @@
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/result_codes.h"
 
-using base::Time;
 using base::TimeDelta;
+using base::TimeTicks;
 
 void TerminateAllChromeProcesses(base::ProcessId browser_pid) {
   // Total time the function will wait for chrome processes
@@ -38,11 +38,11 @@ void TerminateAllChromeProcesses(base::ProcessId browser_pid) {
   for (it = handles.begin(); it != handles.end(); ++it)
     base::KillProcess(*it, ResultCodes::TASKMAN_KILL, false);
 
-  const Time start = Time::Now();
+  const TimeTicks start = TimeTicks::Now();
   for (it = handles.begin();
-       it != handles.end() && Time::Now() - start < kExitTimeout;
+       it != handles.end() && TimeTicks::Now() - start < kExitTimeout;
        ++it) {
-    int64 wait_time_ms = (Time::Now() - start).InMilliseconds();
+    int64 wait_time_ms = (TimeTicks::Now() - start).InMilliseconds();
     base::WaitForSingleProcess(*it, wait_time_ms);
   }