Use LoadLibraryExW if applicable in LoadNativeLibrary on Windows

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index a61d57ec74803a23df4b7a9418c169f5d7fc6e6c..4fdf0ceb26b5cbc76664f0f2d976780a506808a8 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -24514,6 +24514,15 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="LibraryLoader.LoadNativeLibraryWindows"
+    enum="LoadLibraryResultCategory">
+  <owner>chengx@chromium.org</owner>
+  <summary>
+    This metric records the LoadLibraryExW and LoadLibraryW Windows API call
+    results, which are used in native_library_win.cc.
+  </summary>
+</histogram>
+
 <histogram name="LibraryLoader.NativeLibraryHack" enum="BooleanUsage">
   <obsolete>
     Deprecated as of 11/2014, removed from code.
@@ -98778,6 +98787,14 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="23" label="Unnamed"/>
 </enum>
 
+<enum name="LoadLibraryResultCategory" type="int">
+  <int value="0" label="LoadLibraryExW Succeeded"/>
+  <int value="1" label="LoadLibraryExW Fail, LoadLibraryW Succeeded"/>
+  <int value="2" label="LoadLibraryExW Fail, LoadLibraryW Fail"/>
+  <int value="3" label="LoadLibraryExW Unavailable, LoadLibraryW Succeeded"/>
+  <int value="4" label="LoadLibraryExW Unavailable, LoadLibraryW Fail"/>
+</enum>
+
 <enum name="LoadType" type="int">
   <int value="0" label="UNDEFINED_LOAD">Not yet initialized</int>
   <int value="1" label="RELOAD">User pressed reload</int>