[Contextual Search] Add a handle to the bar when Chrome Home is enabled

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

Index: chrome/android/java/src/org/chromium/chrome/browser/toolbar/BottomToolbarPhone.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/toolbar/BottomToolbarPhone.java b/chrome/android/java/src/org/chromium/chrome/browser/toolbar/BottomToolbarPhone.java
index 4710a3418d8e74c2390fc95a98edc1a0ade6492e..725982127ebbb2e7924b3e80c3cd7f2e4cc5a10e 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/toolbar/BottomToolbarPhone.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/toolbar/BottomToolbarPhone.java
@@ -23,6 +23,8 @@ import org.chromium.chrome.browser.widget.bottomsheet.BottomSheet;
 import org.chromium.chrome.browser.widget.bottomsheet.BottomSheetMetrics;
 import org.chromium.chrome.browser.widget.bottomsheet.BottomSheetObserver;
 import org.chromium.chrome.browser.widget.bottomsheet.EmptyBottomSheetObserver;
+import org.chromium.ui.resources.dynamics.BitmapDynamicResource;
+import org.chromium.ui.resources.dynamics.DynamicResourceLoader;
 
 /**
  * Phone specific toolbar that exists at the bottom of the screen.
@@ -85,6 +87,12 @@ public class BottomToolbarPhone extends ToolbarPhone {
     /** The dark version of the toolbar handle; this is the default handle to use. */
     private final Bitmap mHandleDark;
 
+    /**
+     * The resource id for the dark version of the toolbar handle; used to register a dynamic
+     * resource.
+     */
+    private int mHandleDarkResourceId;
+
     /** A handle to the bottom sheet. */
     private BottomSheet mBottomSheet;
 
@@ -355,4 +363,21 @@ public class BottomToolbarPhone extends ToolbarPhone {
 
         otherToolbar.requestLayout();
     }
+
+    /**
+     * Retrieve a resource id for the dark toolbar handle, registering it as a dynamic resource if
+     * it has not been previously registered.
+     * @param resourceLoader The {@link DynamicResourceLoader} used to register the handle bitmap.
+     * @return The resource id for the toolbar handle.
+     */
+    public int getHandleBitmapResourceId(DynamicResourceLoader resourceLoader) {
+        if (mHandleDarkResourceId == 0) {
+            mHandleDarkResourceId = ApiCompatibilityUtils.generateViewId();
+            BitmapDynamicResource handleDarkResource =
+                    new BitmapDynamicResource(mHandleDarkResourceId);
+            handleDarkResource.setBitmap(mHandleDark);
+            resourceLoader.registerResource(mHandleDarkResourceId, handleDarkResource);
+        }
+        return mHandleDarkResourceId;
+    }
 }