Make showing the page title in a custom tab a dev option

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 078f52aa3998ac50a70e74dae51363daef40d82d..bc0ab8127870cceefd8326b08ad9803e8975849c 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
@@ -18,6 +18,7 @@ import android.text.TextUtils;
 import android.text.TextUtils.TruncateAt;
 import android.util.AttributeSet;
 import android.util.Pair;
+import android.util.TypedValue;
 import android.view.KeyEvent;
 import android.view.MotionEvent;
 import android.view.View;
@@ -176,6 +177,15 @@ 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));
+    }
+
+    @Override
     public void setTitleToPageTitle() {
         Tab currentTab = getToolbarDataProvider().getTab();
         if (currentTab == null || TextUtils.isEmpty(currentTab.getTitle())) {