Android: UMA histogram for coldstart-to-commit

chrome/android/java/src/org/chromium/chrome/browser/UmaUtils.java

Index: chrome/android/java/src/org/chromium/chrome/browser/UmaUtils.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/UmaUtils.java b/chrome/android/java/src/org/chromium/chrome/browser/UmaUtils.java
index deb568ae5cfc44657157139db258fdffd929ec8e..ff2e9d5c4fe5955b3709824c26a6a667705a356e 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/UmaUtils.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/UmaUtils.java
@@ -13,6 +13,8 @@ public class UmaUtils {
 
     private static long sApplicationStartWallClockMs;
 
+    private static boolean sRunningApplicationStart;
+
     /**
      * Record the time at which the activity started. This should be called asap after
      * the start of the activity's onCreate function.
@@ -25,6 +27,25 @@ public class UmaUtils {
         sApplicationStartWallClockMs = System.currentTimeMillis();
     }
 
+    /**
+     * Whether the application is in the early stage since the browser process start. The
+     * "application start" ends right after the last histogram related to browser startup is
+     * recorded. Currently, the very first navigation commit in the lifetime of the process ends the
+     * "application start".
+     * Must only be called on the UI thread.
+     */
+    public static boolean isRunningApplicationStart() {
+        return sRunningApplicationStart;
+    }
+
+    /**
+     * Marks/unmarks the "application start" stage of the browser process lifetime.
+     * Must only be called on the UI thread.
+     */
+    public static void setRunningApplicationStart(boolean isAppStart) {
+        sRunningApplicationStart = isAppStart;
+    }
+
     @CalledByNative
     private static long getMainEntryPointTime() {
         return sApplicationStartWallClockMs;