[Android] Upstreamed Stars UMA from iOS.

components/enhanced_bookmarks/enhanced_bookmark_utils.h

Index: components/enhanced_bookmarks/enhanced_bookmark_utils.h
diff --git a/components/enhanced_bookmarks/enhanced_bookmark_utils.h b/components/enhanced_bookmarks/enhanced_bookmark_utils.h
index dc9cf3c85665fda96c7a4b5fef3b465e04ce0b46..05da5feb1297c35ecd94f635b4e67cc471915009 100644
--- a/components/enhanced_bookmarks/enhanced_bookmark_utils.h
+++ b/components/enhanced_bookmarks/enhanced_bookmark_utils.h
@@ -17,6 +17,22 @@ class BookmarkModel;
 
 namespace enhanced_bookmarks {
 
+static const char kLaunchLocationUMA[] = "Stars.LaunchLocation";
+
+// Possible locations where a bookmark can be opened from.
+//
+// A Java counterpart will be generated for this enum.
+// GENERATED_JAVA_ENUM_PACKAGE: org.chromium.chrome.browser.enhancedbookmark
+enum LaunchLocation {
+  ALL_ITEMS,

[noyau (Ping after 24h), 2015/02/04 12:53:40]

As those values have significance outside of the code, please assign them
numbers 

ALL_ITEMs = 0;

[Kibeom Kim (inactive), 2015/02/04 17:57:32]

Done.

+  UNCATEGORIZED,  // Deprecated.
+  FOLDER,
+  FILTER,
+  SEARCH,
+  BOOKMARK_EDITOR,
+  COUNT,
+};

[noyau (Ping after 24h), 2015/02/04 12:53:40]

Since this is used externally, I'd put a = 0 for the first item.

I think we are now missing a TOP_LEVEL entry in there, for the three top level
folders.

[lpromero, 2015/02/04 13:33:36]

They are considered as FOLDER.

+
 // The vector is sorted in place.
 // All of the bookmarks in |nodes| must be urls.
 void SortBookmarksByName(std::vector<const BookmarkNode*>& nodes);