Add User Actions and adding more details to UMA metrics for overscroll navigation

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 eb17a0cc14d781f78a71e26c4012c0fa3a75adbc..2021c1f50ec42ac1b497a0348323019b43d7c807 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -43270,6 +43270,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="Overscroll.Cancelled" enum="NavigationDirection">
+  <obsolete>
+    Deprecated as of Chrome 59 in favour of Overscroll.Cancelled3.
+  </obsolete>
   <owner>rbyers@chromium.org</owner>
   <owner>mfomitchev@chromium.org</owner>
   <summary>
@@ -43277,25 +43280,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
-<histogram name="Overscroll.Completed" enum="OverscrollMode">
-  <obsolete>
-    Deprecated as of Chrome 44 in favour of Overscroll.Cancelled and
-    Overscroll.Navigated2.
-  </obsolete>
-  <owner>rbyers@chromium.org</owner>
+<histogram name="Overscroll.Cancelled3" enum="OverscrollNavigationType">
   <owner>mfomitchev@chromium.org</owner>
-  <summary>Completed overscroll gestures.</summary>
-  <details>
-    An overscroll gesture starts when user scrolls past the edge of the web page
-    and continues scrolling in the same direction. An overscroll gesture is
-    completed when user stops scrolling (e.g. by lifting the fingers from the
-    touchscreen or touchpad).
-  </details>
+  <summary>
+    Overscroll gestures that were aborted before they were completed.
+  </summary>
 </histogram>
 
-<histogram name="Overscroll.Navigated" enum="OverscrollMode">
+<histogram name="Overscroll.Navigated2" enum="NavigationDirection">
   <obsolete>
-    Deprecated as of Chrome 44 to switch to NavigationDirection enum.
+    Deprecated as of Chrome 59 in favour of Overscroll.Navigated3.
   </obsolete>
   <owner>rbyers@chromium.org</owner>
   <owner>mfomitchev@chromium.org</owner>
@@ -43305,8 +43299,7 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
-<histogram name="Overscroll.Navigated2" enum="NavigationDirection">
-  <owner>rbyers@chromium.org</owner>
+<histogram name="Overscroll.Navigated3" enum="OverscrollNavigationType">
   <owner>mfomitchev@chromium.org</owner>
   <summary>
     Navigations that were triggered due to completed overscroll gesture. Note
@@ -43314,24 +43307,23 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
-<histogram name="Overscroll.Started" enum="OverscrollMode">
+<histogram name="Overscroll.Started2" enum="NavigationDirection">
   <obsolete>
-    Deprecated as of Chrome 44 to switch to NavigationDirection enum.
+    Deprecated as of Chrome 59 in favour of Overscroll.Started3.
   </obsolete>
   <owner>rbyers@chromium.org</owner>
   <owner>mfomitchev@chromium.org</owner>
   <summary>
-    Overscroll gestures initiated by the user. Note that not all overcroll
+    Overscroll gestures initiated by the user. Note that not all overscroll
     gestures started are completed (e.g. the overscroll gesture is aborted if
     user clicks or presses a key during the gesture).
   </summary>
 </histogram>
 
-<histogram name="Overscroll.Started2" enum="NavigationDirection">
-  <owner>rbyers@chromium.org</owner>
+<histogram name="Overscroll.Started3" enum="OverscrollNavigationType">
   <owner>mfomitchev@chromium.org</owner>
   <summary>
-    Overscroll gestures initiated by the user. Note that not all overcroll
+    Overscroll gestures initiated by the user. Note that not all overscroll
     gestures started are completed (e.g. the overscroll gesture is aborted if
     user clicks or presses a key during the gesture).
   </summary>
@@ -99498,6 +99490,9 @@ value.
 </enum>
 
 <enum name="NavigationDirection" type="int">
+  <obsolete>
+    Deprecated as of Chrome 59 in favour of OverscrollNavigationType.
+  </obsolete>
   <summary>Direction of the overscroll gesture.</summary>
   <int value="0" label="None">Did not scroll</int>
   <int value="1" label="Forward">Scrolled forward</int>
@@ -101310,6 +101305,18 @@ value.
   <int value="4" label="East">Scrolled from left towards right</int>
 </enum>
 
+<enum name="OverscrollNavigationType" type="int">
+  <summary>
+    Type of the overscroll gesture based on direction and source   (i.e.
+    touchpad vs. touch screen).
+  </summary>
+  <int value="0" label="None">Did not scroll</int>
+  <int value="1" label="Forward">Scrolled forward using touchpad</int>
+  <int value="2" label="Back">Scrolled back using touchpad</int>
+  <int value="3" label="Forward">Scrolled forward using touch screen</int>
+  <int value="4" label="Back">Scrolled back using touch screen</int>
+</enum>
+
 <enum name="P2PLookupResult" type="int">
   <int value="0" label="Found"/>
   <int value="1" label="Not Found"/>