Move UrlBar background drawing to CC.

chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java

Index: chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java b/chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java
index 930208123c6ab214bc94e69990206e08f1174617..2c7a455f1b468f3fc699bec4af090f855cd2cad6 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java
@@ -47,6 +47,7 @@ import org.chromium.chrome.browser.tab.TabObserver;
 import org.chromium.chrome.browser.tabmodel.EmptyTabModelSelectorObserver;
 import org.chromium.chrome.browser.tabmodel.TabCreatorManager;
 import org.chromium.chrome.browser.tabmodel.TabModelSelector;
+import org.chromium.chrome.browser.util.ColorUtils;
 import org.chromium.chrome.browser.widget.ClipDrawableProgressBar.DrawingInfo;
 import org.chromium.chrome.browser.widget.ControlContainer;
 import org.chromium.content.browser.ContentReadbackHandler;
@@ -687,6 +688,13 @@ public class CompositorViewHolder extends FrameLayout
     }
 
     @Override
+    public float getTopControlsUrlBarAlpha() {
+        return mTabVisible == null
+                ? 1.f
+                : ColorUtils.getTextBoxAlphaForToolbarBackground(mTabVisible);
+    }
+
+    @Override
     public boolean areTopControlsPermanentlyHidden() {
         return mFullscreenManager != null && mFullscreenManager.areTopControlsPermanentlyHidden();
     }