Added more UMA statistics for downloads.

Split from CL 7134019.

BUG=None
TEST=None


Review URL: http://codereview.chromium.org/7778038

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@99991 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 33 insertions, 3 deletions

diff --git a/content/browser/download/download_item.cc b/content/browser/download/download_item.cc
index 6d9dc303..0809872 100644
--- a/content/browser/download/download_item.cc
+++ b/content/browser/download/download_item.cc
@@ -409,7 +409,7 @@ void DownloadItem::Completed() {
   DCHECK(all_data_saved_);
   TransitionTo(COMPLETE);
   download_manager_->DownloadCompleted(id());
-  download_stats::RecordDownloadCompleted(start_tick_);
+  download_stats::RecordDownloadCompleted(start_tick_, received_bytes_);
 
   if (auto_opened_) {
     // If it was already handled by the delegate, do nothing.
diff --git a/content/browser/download/download_stats.cc b/content/browser/download/download_stats.cc
index c51f68a..90d943a 100644
--- a/content/browser/download/download_stats.cc
+++ b/content/browser/download/download_stats.cc
@@ -22,9 +22,16 @@ void RecordDownloadCount(DownloadCountTypes type) {
       "Download.Counts", type, DOWNLOAD_COUNT_TYPES_LAST_ENTRY);
 }
 
-void RecordDownloadCompleted(const base::TimeTicks& start) {
+void RecordDownloadCompleted(const base::TimeTicks& start, int64 download_len) {
   RecordDownloadCount(COMPLETED_COUNT);
   UMA_HISTOGRAM_LONG_TIMES("Download.Time", (base::TimeTicks::Now() - start));
+  int64 max = 1024 * 1024 * 1024;  // One Terabyte.
+  download_len /= 1024;  // In Kilobytes
+  UMA_HISTOGRAM_CUSTOM_COUNTS("Download.DownloadSize",
+                              download_len,
+                              1,
+                              max,
+                              256);
 }
 
 void RecordDownloadInterrupted(int error, int64 received, int64 total) {
@@ -72,6 +79,17 @@ void RecordDownloadInterrupted(int error, int64 received, int64 total) {
   UMA_HISTOGRAM_BOOLEAN("Download.InterruptedUnknownSize", unknown_size);
 }
 
+void RecordDownloadWriteSize(size_t data_len) {
+  RecordDownloadCount(WRITE_SIZE_COUNT);
+  int max = 1024 * 1024;  // One Megabyte.
+  UMA_HISTOGRAM_CUSTOM_COUNTS("Download.WriteSize", data_len, 1, max, 256);
+}
+
+void RecordDownloadWriteLoopCount(int count) {
+  RecordDownloadCount(WRITE_LOOP_COUNT);
+  UMA_HISTOGRAM_ENUMERATION("Download.WriteLoopCount", count, 20);
+}
+
 namespace {
 
 enum DownloadContent {
diff --git a/content/browser/download/download_stats.h b/content/browser/download/download_stats.h
index b1e7624..0007bcf 100644
--- a/content/browser/download/download_stats.h
+++ b/content/browser/download/download_stats.h
@@ -57,6 +57,12 @@ enum DownloadCountTypes {
   // Downloads that were interrupted by the OS.
   INTERRUPTED_COUNT,
 
+  // Write sizes for downloads.
+  WRITE_SIZE_COUNT,
+
+  // Counts iterations of the BaseFile::AppendDataToFile() loop.
+  WRITE_LOOP_COUNT,
+
   DOWNLOAD_COUNT_TYPES_LAST_ENTRY
 };
 
@@ -64,7 +70,7 @@ enum DownloadCountTypes {
 void RecordDownloadCount(DownloadCountTypes type);
 
 // Record COMPLETED_COUNT and how long the download took.
-void RecordDownloadCompleted(const base::TimeTicks& start);
+void RecordDownloadCompleted(const base::TimeTicks& start, int64 download_len);
 
 // Record INTERRUPTED_COUNT, |error|, |received| and |total| bytes.
 void RecordDownloadInterrupted(int error, int64 received, int64 total);
@@ -72,6 +78,12 @@ void RecordDownloadInterrupted(int error, int64 received, int64 total);
 // Records the mime type of the download.
 void RecordDownloadMimeType(const std::string& mime_type);
 
+// Record WRITE_SIZE_COUNT and data_len.
+void RecordDownloadWriteSize(size_t data_len);
+
+// Record WRITE_LOOP_COUNT and number of loops.
+void RecordDownloadWriteLoopCount(int count);
+
 }  // namespace download_stats
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_STATS_H_