Add UMA for estimating disk bandwidth and the time saved with parallel download

content/browser/download/mock_download_file.h

Index: content/browser/download/mock_download_file.h
diff --git a/content/browser/download/mock_download_file.h b/content/browser/download/mock_download_file.h
index d982da06cf7281263782b74261b2e45f3e55de90..1d7dda1a431a7ea7d429b611b43b64be62a53b0a 100644
--- a/content/browser/download/mock_download_file.h
+++ b/content/browser/download/mock_download_file.h
@@ -51,6 +51,7 @@ class MockDownloadFile : public DownloadFile {
   MOCK_METHOD0(Finish, void());
   MOCK_CONST_METHOD0(FullPath, const base::FilePath&());
   MOCK_CONST_METHOD0(InProgress, bool());
+  MOCK_METHOD0(WasPaused, void());
   MOCK_CONST_METHOD0(BytesSoFar, int64_t());
   MOCK_CONST_METHOD0(CurrentSpeed, int64_t());
   MOCK_METHOD1(GetHash, bool(std::string* hash));