Add histograms for the Contextual Search field trial.

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 540e482ac84d1b24d1a5c6210eb366f54ce1d12c..7ec8f66b8fd6ace8796d475840b75744ac7fbe17 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -17773,6 +17773,34 @@ other types of suffix sets.
   </summary>
 </histogram>
 
+<histogram name="Search.ContextualSearchOptCard"
+    enum="ContextualSearchOptCardAction">
+  <summary>The type of action taken in the Opt-in card.</summary>
+</histogram>
+
+<histogram name="Search.ContextualSearchOptPeekCard"
+    enum="ContextualSearchPeekCardAction">
+  <summary>The type of action taken when the Opt-in card is peeking.</summary>
+</histogram>
+
+<histogram name="Search.ContextualSearchPeekCard"
+    enum="ContextualSearchPeekCardAction">
+  <summary>The type of action taken when the Search card is peeking.</summary>
+</histogram>
+
+<histogram name="Search.ContextualSearchTap" enum="ContextualSearchTapAction">
+  <summary>The type of tap action taken by opted-in users.</summary>
+</histogram>
+
+<histogram name="Search.ContextualSearchTapUndecided"
+    enum="ContextualSearchTapAction">
+  <summary>The type of tap action taken by undecided users.</summary>
+</histogram>
+
+<histogram name="Search.ContextualSearchTimeToSearch" units="milliseconds">
+  <summary>The time between tapping on a word and performing a search.</summary>
+</histogram>
+
 <histogram name="Search.DefaultSearchProvider" enum="OmniboxSearchEngine">
   <summary>
     The id of the default search engine that is loaded after Chrome startup. See
@@ -23601,6 +23629,28 @@ other types of suffix sets.
   <int value="4" label="TEST_NOT_RUN"/>
 </enum>
 
+<enum name="ContextualSearchOptCardAction" type="int">
+  <int value="0" label="Opt-in"/>
+  <int value="1" label="Opt-out"/>
+  <int value="2" label="Learn More"/>
+  <int value="3" label="Dismiss by Tapping on the Page"/>
+  <int value="4" label="Dismiss by Scrolling the Page"/>
+  <int value="5" label="Dismiss by Leaving the Page"/>
+</enum>
+
+<enum name="ContextualSearchPeekCardAction" type="int">
+  <int value="0" label="Tap Card"/>
+  <int value="1" label="Dismiss by Tapping on the Page"/>
+  <int value="2" label="Dismiss by Scrolling the Page"/>
+  <int value="3" label="Dismiss by Leaving the Page"/>
+</enum>
+
+<enum name="ContextualSearchTapAction" type="int">
+  <int value="0" label="Tap Word"/>
+  <int value="1" label="Tap Ignored"/>
+  <int value="2" label="Tap Invalid"/>
+</enum>
+
 <enum name="CookieDeletionCause" type="int">
   <summary>Reason why a cookie was removed from the cookie store</summary>
   <int value="0" label="explicit">
@@ -33100,6 +33150,18 @@ other types of suffix sets.
   <affected-histogram name="PLT.LoadType"/>
 </fieldtrial>
 
+<fieldtrial name="ContextualSearch">
+  <group name="Control"/>
+  <group name="Tap"/>
+  <group name="TapForced"/>
+  <affected-histogram name="Search.ContextualSearchOptCard"/>
+  <affected-histogram name="Search.ContextualSearchOptPeekCard"/>
+  <affected-histogram name="Search.ContextualSearchPeekCard"/>
+  <affected-histogram name="Search.ContextualSearchTap"/>
+  <affected-histogram name="Search.ContextualSearchTapUndecided"/>
+  <affected-histogram name="Search.ContextualSearchTimeToSearch"/>
+</fieldtrial>
+
 <fieldtrial name="CrosFirstRunStep" separator="">
   <group name="AppList"/>
   <group name="Tray"/>