Introduce moderate binding

chrome/android/java_staging/src/org/chromium/chrome/browser/DeferredStartupHandler.java

Index: chrome/android/java_staging/src/org/chromium/chrome/browser/DeferredStartupHandler.java
diff --git a/chrome/android/java_staging/src/org/chromium/chrome/browser/DeferredStartupHandler.java b/chrome/android/java_staging/src/org/chromium/chrome/browser/DeferredStartupHandler.java
index bd54eaa535c10a8bb4bbbac55816a91cd438cbf3..16c3e68586e784293e7f6bedacd39bb88fe27d4a 100644
--- a/chrome/android/java_staging/src/org/chromium/chrome/browser/DeferredStartupHandler.java
+++ b/chrome/android/java_staging/src/org/chromium/chrome/browser/DeferredStartupHandler.java
@@ -5,7 +5,9 @@
 package org.chromium.chrome.browser;
 
 import android.os.AsyncTask;
+import android.text.TextUtils;
 
+import org.chromium.base.FieldTrialList;
 import org.chromium.base.PowerMonitor;
 import org.chromium.base.ThreadUtils;
 import org.chromium.base.TraceEvent;
@@ -20,11 +22,20 @@ import org.chromium.chrome.browser.precache.PrecacheLauncher;
 import org.chromium.chrome.browser.preferences.ChromePreferenceManager;
 import org.chromium.chrome.browser.preferences.privacy.PrivacyPreferencesManager;
 import org.chromium.chrome.browser.share.ShareHelper;
+import org.chromium.components.variations.VariationsAssociatedData;
+import org.chromium.content.browser.ChildProcessLauncher;
 
 /**
  * Handler for application level tasks to be completed on deferred startup.
  */
 public class DeferredStartupHandler {
+    // Constants for trial of moderate binding support.
+    private static final String MODERATE_BINDING_TRIAL_NAME = "MobileModerateBinding";
+    private static final String MODERATE_BINDING_LOW_REDUCE_RATIO_PARAM = "low_reduce_ratio";
+    private static final String MODERATE_BINDING_HIGH_REDUCE_RATIO_PARAM = "high_reduce_ratio";
+    private static final String MODERATE_BINDING_DISABLED_VALUE = "Disabled";
+    private static final float DEFAULUT_MODERATE_BINDING_REDUCE_RATIO = 0.25f;

[Yaron, 2015/06/11 16:54:34]

DEFAULT_

[Jaekyun Seok (inactive), 2015/06/12 06:50:20]

Done.

+
     private static DeferredStartupHandler sDeferredStartupHandler;
     private boolean mDeferredStartupComplete;
 
@@ -105,6 +116,34 @@ public class DeferredStartupHandler {
         // Clear any media notifications that existed when Chrome was last killed.
         MediaNotificationService.clearMediaNotifications(application);
 
+        String trialName = FieldTrialList.findFullName(MODERATE_BINDING_TRIAL_NAME);

[Yaron, 2015/06/11 16:54:34]

extract all this to static helper function

[Jaekyun Seok (inactive), 2015/06/12 06:50:19]

Done.

+        if (!TextUtils.isEmpty(trialName)
+                && !MODERATE_BINDING_DISABLED_VALUE.equalsIgnoreCase(trialName)) {
+            String lowReduceRatioValue = VariationsAssociatedData.getVariationParamValue(
+                    MODERATE_BINDING_TRIAL_NAME, MODERATE_BINDING_LOW_REDUCE_RATIO_PARAM);
+            String highReduceRatioValue = VariationsAssociatedData.getVariationParamValue(
+                    MODERATE_BINDING_TRIAL_NAME, MODERATE_BINDING_HIGH_REDUCE_RATIO_PARAM);
+            float lowReduceRatio = DEFAULUT_MODERATE_BINDING_REDUCE_RATIO;
+            float highReduceRatio = DEFAULUT_MODERATE_BINDING_REDUCE_RATIO * 2;
+            if (!TextUtils.isEmpty(lowReduceRatioValue)) {
+                try {
+                    lowReduceRatio = Float.parseFloat(lowReduceRatioValue);
+                } catch (NumberFormatException e) {
+                    // Ignore exception.
+                }
+            }
+            if (!TextUtils.isEmpty(highReduceRatioValue)) {
+                try {
+                    highReduceRatio = Float.parseFloat(highReduceRatioValue);
+                } catch (NumberFormatException e) {
+                    // Ignore exception.
+                }
+            }
+            if (highReduceRatio > 1f) highReduceRatio = 1f;
+            if (lowReduceRatio > highReduceRatio) lowReduceRatio = highReduceRatio;
+            ChildProcessLauncher.startModerateBinding(lowReduceRatio, highReduceRatio);
+        }
+
         mDeferredStartupComplete = true;
     }