Measure time spent during StrictMode violations.

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java
index fe2af4fd64eeeba0a5007f1e79643eb582f19c82..21db4502bd4f6395565875acc2318101a8ca007d 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java
@@ -11,6 +11,7 @@ import android.graphics.drawable.Drawable;
 import android.net.Uri;
 import android.os.Bundle;
 import android.os.StrictMode;
+import android.os.SystemClock;
 import android.text.TextUtils;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -25,6 +26,7 @@ import org.chromium.base.ApplicationStatus;
 import org.chromium.base.Log;
 import org.chromium.base.StreamUtil;
 import org.chromium.base.VisibleForTesting;
+import org.chromium.base.metrics.RecordHistogram;
 import org.chromium.blink_public.platform.WebDisplayMode;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.TabState;
@@ -48,6 +50,7 @@ import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
+import java.util.concurrent.TimeUnit;
 
 /**
  * Displays a webapp in a nearly UI-less Chrome (InfoBars still appear).
@@ -169,8 +172,11 @@ public class WebappActivity extends FullScreenActivity {
         StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskReads();
         StrictMode.allowThreadDiskWrites();
         try {
+            long time = SystemClock.elapsedRealtime();
             foutput = new FileOutputStream(tabFile);
             TabState.saveState(foutput, getActivityTab().getState(), false);
+            RecordHistogram.recordTimesHistogram("Android.StrictMode.WebappSaveState",
+                    SystemClock.elapsedRealtime() - time, TimeUnit.MILLISECONDS);
         } catch (FileNotFoundException exception) {
             Log.e(TAG, "Failed to save out tab state.", exception);
         } catch (IOException exception) {
@@ -289,7 +295,7 @@ public class WebappActivity extends FullScreenActivity {
             }
             mWebappUma.recordSplashscreenIconType(splashScreenIconType);
             mWebappUma.recordSplashscreenIconSize(
-                    Math.round((float) displayIcon.getWidth()

[Yaron, 2016/01/21 20:48:15]

was this removal intentional?

[Peter Wen, 2016/01/21 20:59:45]

Yeah, eclipse auto-removed it since density is a float already.

+                    Math.round(displayIcon.getWidth()
                             / getResources().getDisplayMetrics().density));
         }