Timing code for measuring DLL load performance.

BUG=18466
TEST=reduce DLL sizes with -O2 and other options, and test performance with this code.

Review URL: http://codereview.chromium.org/165039

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@24017 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 29 insertions, 1 deletions

diff --git a/media/base/media_win.cc b/media/base/media_win.cc
index 31bfe43..975a301 100644
--- a/media/base/media_win.cc
+++ b/media/base/media_win.cc
@@ -10,6 +10,23 @@
 #include "base/logging.h"
 #include "base/path_service.h"
 
+// Enable timing code by turning on TESTING macro.
+//#define TESTING 1
+
+#ifdef TESTING
+#include "base/string_util.h"
+#include "base/time.h"
+
+namespace {
+// Fetch current time as milliseconds.
+// Return as double for high duration and precision.
+// TODO(fbarchard): integrate into base/time.h
+static inline double GetTime() {
+  return base::TimeTicks::HighResNow().ToInternalValue() * (1.0 / 1000.0);
+}
+}
+#endif
+
 namespace media {
 
 namespace {
@@ -49,9 +66,20 @@ bool InitializeMediaLibrary(const FilePath& base_path) {
   HMODULE libs[arraysize(path_keys)] = {NULL};
   for (size_t i = 0; i < arraysize(path_keys); ++i) {
     FilePath path = base_path.Append(GetDLLName(path_keys[i]));
-    libs[i] = LoadLibrary(path.value().c_str());
+#ifdef TESTING
+    double dll_loadtime_start = GetTime();
+#endif
+    const wchar_t* cpath = path.value().c_str();
+    libs[i] = LoadLibrary(cpath);
     if (!libs[i])
       break;
+#ifdef TESTING
+    double dll_loadtime_end = GetTime();
+    std::wstring outputbuf = StringPrintf(L"DLL loadtime %5.2f ms, %ls\n",
+        dll_loadtime_end - dll_loadtime_start,
+        cpath);
+    OutputDebugStringW(outputbuf.c_str());
+#endif
   }
 
   // Check that we loaded all libraries successfully.  We only need to check the