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 8a7a577ecfb3f6eb9d33bda98f934a4bf496115d..10a64ec9a16bd570af0f56cf59e28ddcf3ba8dad 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -43674,6 +43674,9 @@ 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>
@@ -43681,6 +43684,13 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Overscroll.Cancelled3" enum="OverscrollNavigationType">
+  <owner>mfomitchev@chromium.org</owner>
+  <summary>
+    Overscroll gestures that were aborted before they were completed.
+  </summary>
+</histogram>
+
 <histogram name="Overscroll.Completed" enum="OverscrollMode">
   <obsolete>
     Deprecated as of Chrome 44 in favour of Overscroll.Cancelled and
@@ -43710,6 +43720,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="Overscroll.Navigated2" enum="NavigationDirection">
+  <obsolete>
+    Deprecated as of Chrome 59 in favour of Overscroll.Navigated3.
+  </obsolete>
   <owner>rbyers@chromium.org</owner>
   <owner>mfomitchev@chromium.org</owner>
   <summary>
@@ -43718,6 +43731,14 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Overscroll.Navigated3" enum="OverscrollNavigationType">
+  <owner>mfomitchev@chromium.org</owner>
+  <summary>
+    Navigations that were triggered due to completed overscroll gesture. Note
+    that not all completed overscroll gestures trigger a navigation.
+  </summary>
+</histogram>
+
 <histogram name="Overscroll.Started" enum="OverscrollMode">
   <obsolete>
     Deprecated as of Chrome 44 to switch to NavigationDirection enum.
@@ -43732,10 +43753,22 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="Overscroll.Started2" enum="NavigationDirection">
+  <obsolete>
+    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.Started3" enum="OverscrollNavigationType">
+  <owner>mfomitchev@chromium.org</owner>
+  <summary>
+    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>
@@ -100229,6 +100262,9 @@ 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>
@@ -102041,6 +102077,18 @@ 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"/>