Update histograms.xml with toolbar first draw histograms

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 93fbf671ef5846458af10e83e452f9fafe20354b..61bdbd65bec96675df77351be7e331932e5375da 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -4495,6 +4495,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="CustomTabs.ClientAppId" enum="ClientAppId">
+  <owner>yusufo@chromium.org</owner>
+  <summary>
+    Android: AppId declared by the launching application in EXTRA_APPLICATION_ID
+    in a custom tab. This histogram is used as a means to count the total
+    instances of custom tabs created meanwhile binning them across launching
+    apps that have identified themselves.
+  </summary>
+</histogram>
+
 <histogram name="CustomTabs.IntentToFirstCommitNavigationTime" units="ms">
   <owner>lizeb@chromium.org</owner>
   <summary>
@@ -17243,6 +17253,14 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="MobileStartup.ToolbarFirstDrawTime" units="milliseconds">
+  <owner>yusufo@chromium.org</owner>
+  <summary>
+    Android: The time it takes from launch to the completion of first draw for
+    Toolbar. This excludes activity creation time spent in framework.
+  </summary>
+</histogram>
+
 <histogram name="ModuleIntegrityVerification.BytesModified" units="bytes">
   <owner>anthonyvd@chromium.org</owner>
   <summary>
@@ -50947,6 +50965,21 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="2" label="Fixed Address Load Not Attempted"/>
 </enum>
 
+<enum name="ClientAppId" type="int">
+  <int value="0" label="Other"/>
+  <int value="1" label="Gmail"/>
+  <int value="2" label="Facebook"/>
+  <int value="3" label="Plus"/>
+  <int value="4" label="Twitter"/>
+  <int value="5" label="Chrome"/>
+  <int value="6" label="Hangouts"/>
+  <int value="7" label="Messenger"/>
+  <int value="8" label="News"/>
+  <int value="9" label="Line"/>
+  <int value="10" label="Whatsapp"/>
+  <int value="11" label="Gsa"/>
+</enum>
+
 <enum name="ClipboardAction" type="int">
   <int value="0" label="Write from non-Incognito"/>
   <int value="1" label="Write from Incognito"/>
@@ -69193,6 +69226,17 @@ To add a new entry, add it with any value and run test to compute valid value.
   <affected-histogram name="DiskBasedCertCache.CertIo"/>
 </histogram_suffixes>
 
+<histogram_suffixes name="ChromeActivityName" separator=".">
+  <suffix name="ChromeTabbedActivity"
+      label="Activity launched in TABBED mode on Android"/>
+  <suffix name="DocumentActivity"
+      label="Activity launched in DOCUMENT mode (Tabs and apps together) on
+             Android"/>
+  <suffix name="CustomTabActivity"
+      label="Activity launched with a CUSTOM TAB on Android"/>
+  <affected-histogram name="MobileStartup.ToolbarFirstDrawTime"/>
+</histogram_suffixes>
+
 <histogram_suffixes name="ChromeOS.MachineIdRegen.AgeSeconds">
   <suffix name="Network"/>
   <suffix name="Periodic"/>