Reduce infobar lag on KitKat from 1000ms to 100ms.

chrome/android/java/src/org/chromium/chrome/browser/infobar/InfoBarLayout.java

Index: chrome/android/java/src/org/chromium/chrome/browser/infobar/InfoBarLayout.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/infobar/InfoBarLayout.java b/chrome/android/java/src/org/chromium/chrome/browser/infobar/InfoBarLayout.java
index 50d90795b6940503dd851212ad17d75c06947ff1..c021c25cfe51ca87963695bef74b71c7389c8389 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/infobar/InfoBarLayout.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/infobar/InfoBarLayout.java
@@ -139,7 +139,6 @@ public final class InfoBarLayout extends ViewGroup implements View.OnClickListen
     private Button mSecondaryButton;
     private View mCustomButton;
 
-    private Group mMainGroup;
     private Group mButtonGroup;
 
     private boolean mIsUsingBigIcon;
@@ -342,14 +341,12 @@ public final class InfoBarLayout extends ViewGroup implements View.OnClickListen
      * first call to onMeasure().
      */
     void onContentCreated() {
-        mMainGroup = new Group(mMessageLayout);
-
         View[] buttons = Group.filterNullViews(mCustomButton, mSecondaryButton, mPrimaryButton);
         if (buttons.length != 0) mButtonGroup = new Group(buttons);
 
         // Add the child views in the desired focus order.
         if (mIconView != null) addView(mIconView);
-        for (View v : mMainGroup.views) addView(v);
+        addView(mMessageLayout);
         for (View v : mControlLayouts) addView(v);
         if (mButtonGroup != null) {
             for (View v : mButtonGroup.views) addView(v);
@@ -399,6 +396,10 @@ public final class InfoBarLayout extends ViewGroup implements View.OnClickListen
         // big each child wants to be.
         int unspecifiedSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
         for (int i = 0; i < getChildCount(); i++) {
+            // No need to do a preliminary measure() on an InfoBarControlLayout,
+            // since InfoBarControlLayout handles all the measuring logic internally.
+            // TODO(dfalcantara): remove this instanceof check when refactoring this method.
+            if (getChildAt(i) instanceof InfoBarControlLayout) continue;
             measureChild(getChildAt(i), unspecifiedSpec, unspecifiedSpec);
         }