Added histograms for Custom Feedback UI

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 988cba66e31d5b6cc8570ad76b901902ab3f4564..7b411a116baa5a7de5821e89f86c8c3644e442bb 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -446,6 +446,24 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Android.CustomFeedback.Category"
+    enum="AndroidFeedbackCategory">
+  <owner>jwanda@chromium.org</owner>
+  <summary>
+    Recorded when the user selects a category button when in the Custom Feedback
+    UI.
+  </summary>
+</histogram>
+
+<histogram name="Android.CustomFeedback.CategoryDetails"
+    enum="AndroidFeedbackCategoryDetails">
+  <owner>jwanda@chromium.org</owner>
+  <summary>
+    Recorded when a user selects an option related to their problem within the
+    Custom Feedback UI.

[Mark P, 2017/02/02 05:07:50]

Is it possible they select an option without selecting a category first?
If not, then this lgtm.
If so, then what do you end up emitting here?

[JJ, 2017/02/02 19:21:48]

It is not possible to select an option without selecting a category.

+  </summary>
+</histogram>
+
 <histogram name="Android.DownloadManager.Filter"
     enum="AndroidDownloadFilterType">
   <owner>dfalcantara@chromium.org</owner>
@@ -77544,6 +77562,45 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="4" label="EvictAll"/>
 </enum>
 
+<enum name="AndroidFeedbackCategory" type="int">
+  <summary>
+    This list corresponds to the categories the user can press when selecting a
+    category their feedback falls under.
+  </summary>
+  <int value="0" label="Error or blank page"/>
+  <int value="1" label="Chrome crashes or freezes"/>
+  <int value="2" label="Issues with website"/>
+  <int value="3" label="Trouble with something else"/>
+</enum>
+
+<enum name="AndroidFeedbackCategoryDetails" type="int">
+  <summary>
+    This list corresponds to all the possible options a user can press when
+    selecting an option their feedback falls under. Each option is prefixed with
+    a shortened name of the category that the option belongs to.
+  </summary>
+  <int value="0" label="Error Network error"/>
+  <int value="1" label="Error Blank page"/>
+  <int value="2" label="Error Video won't play"/>
+  <int value="3" label="Error Page won't download"/>
+  <int value="4" label="Error Can't connect to Wi-Fi"/>
+  <int value="5" label="Error Other"/>
+  <int value="6" label="Crash Watching videos"/>
+  <int value="7" label="Crash Downloading files"/>
+  <int value="8" label="Crash Browsing websites"/>
+  <int value="9" label="Crash Other"/>
+  <int value="10" label="Website Account or sign-in problems"/>
+  <int value="11" label="Website Advertisements"/>
+  <int value="12" label="Website Video won't play"/>
+  <int value="13" label="Website Slow website"/>
+  <int value="14" label="Website Broken or unreadable website"/>
+  <int value="15" label="Website Other"/>
+  <int value="16" label="Something Website"/>
+  <int value="17" label="Something Tabs"/>
+  <int value="18" label="Something Settings"/>
+  <int value="19" label="Something Other"/>
+</enum>
+
 <enum name="AndroidGATTConnectionErrorCodes" type="int">
   <summary>
     This list includes all errors from the Bluetooth Specification Version 4.2