[Custom Tabs]Introduce the url scaling animation

chrome/android/java/src/org/chromium/chrome/browser/toolbar/CustomTabToolbar.java

Index: chrome/android/java/src/org/chromium/chrome/browser/toolbar/CustomTabToolbar.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/toolbar/CustomTabToolbar.java b/chrome/android/java/src/org/chromium/chrome/browser/toolbar/CustomTabToolbar.java
index cbf639e3c542072cd6bdd422e4932b9e7e6770aa..17505bbf3926cda814e7c42a57b5c2842df4d182 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/toolbar/CustomTabToolbar.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/toolbar/CustomTabToolbar.java
@@ -15,7 +15,6 @@ import android.graphics.drawable.Drawable;
 import android.text.TextUtils;
 import android.util.AttributeSet;
 import android.util.Pair;
-import android.util.TypedValue;
 import android.view.KeyEvent;
 import android.view.MotionEvent;
 import android.view.View;
@@ -60,6 +59,7 @@ public class CustomTabToolbar extends ToolbarLayout implements LocationBar,
     private ImageView mSecurityButton;
     private ImageButton mCustomActionButton;
     private int mSecurityIconType;
+    private boolean mShouldShowTitle;
     private boolean mUseDarkColors;
     private ImageButton mCloseButton;
 
@@ -88,9 +88,9 @@ public class CustomTabToolbar extends ToolbarLayout implements LocationBar,
         mSecurityButton = (ImageButton) findViewById(R.id.security_button);
         mSecurityIconType = ConnectionSecurityLevel.NONE;
         mCustomActionButton = (ImageButton) findViewById(R.id.action_button);
+        mCustomActionButton.setOnLongClickListener(this);
         mCloseButton = (ImageButton) findViewById(R.id.close_button);
         mCloseButton.setOnLongClickListener(this);
-        mCustomActionButton.setOnLongClickListener(this);
         mAnimDelegate = new CustomTabToolbarAnimationDelegate(mSecurityButton, mTitleUrlContainer);
     }
 
@@ -186,11 +186,8 @@ public class CustomTabToolbar extends ToolbarLayout implements LocationBar,
 
     @Override
     public void setShowTitle(boolean showTitle) {
-        int titleVisibility = showTitle ? VISIBLE : GONE;
-        int urlTextSizeId = showTitle
-                ? R.dimen.custom_tabs_url_text_size : R.dimen.location_bar_url_text_size;
-        mTitleBar.setVisibility(titleVisibility);
-        mUrlBar.setTextSize(TypedValue.COMPLEX_UNIT_PX, getResources().getDimension(urlTextSizeId));
+        mShouldShowTitle = showTitle;
+        if (mShouldShowTitle) mAnimDelegate.prepareTitleAnim(mUrlBar, mTitleBar);
     }
 
     @Override
@@ -200,6 +197,13 @@ public class CustomTabToolbar extends ToolbarLayout implements LocationBar,
             mTitleBar.setText("");
             return;
         }
+
+        // It takes some time to parse the title of the webcontent, and before that Tab#getTitle
+        // always return the url. We postpone the title animation until the title is authentic.
+        if (mShouldShowTitle && !TextUtils.equals(currentTab.getTitle(), currentTab.getUrl())) {
+            mAnimDelegate.startTitleAnimation(getContext());
+        }
+
         mTitleBar.setText(currentTab.getTitle());
     }