Refactor ProfileInfoCache in c/b/profiles

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 cf5e0ca739925d7b26fd7d258e76ed1b7a5cf0da..e546c13f1d60e6c55f5e0e104fb901055bd709f4 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -40557,12 +40557,30 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>Length of time to retrieve profile.</summary>
 </histogram>
 
+<histogram name="Profile.GetProfileInfoPath.OutsideUserDir"
+    enum="BooleanEnabled">
+  <owner>anthonyvd@chromium.org</owner>
+  <summary>
+    Whether Profile::InitProfileUserPrefs is called with a profile outside the
+    user data directory. We want to know if the true case ever happens.

[Mike Lerman, 2016/04/13 15:07:41]

We expect this to never happen but need to verify in stable. (and below)

[lwchkg, 2016/04/13 16:50:57]

Done.

+  </summary>
+</histogram>
+
 <histogram name="Profile.HistorySize" units="MB">
   <owner>hajimehoshi@chromium.org</owner>
   <owner>kouhei@chromium.org</owner>
   <summary>Size of the history database.</summary>
 </histogram>
 
+<histogram name="Profile.InitProfileUserPrefs.OutsideUserDir"
+    enum="BooleanEnabled">
+  <owner>anthonyvd@chromium.org</owner>
+  <summary>
+    Whether Profile::InitProfileUserPrefs is called with a profile outside the
+    user data directory. We want to know if the true case ever happens.
+  </summary>
+</histogram>
+
 <histogram name="Profile.LaunchBrowser" enum="ProfileType">
   <owner>rlp@chromium.org</owner>
   <summary>