Introduce TintedImageButton class.

chrome/android/java/src/org/chromium/chrome/browser/widget/TintedImageButton.java

Index: chrome/android/java/src/org/chromium/chrome/browser/widget/TintedImageButton.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/widget/TintedImageButton.java b/chrome/android/java/src/org/chromium/chrome/browser/widget/TintedImageButton.java
new file mode 100644
index 0000000000000000000000000000000000000000..4a46a39efdffb697a098303cbf3e646fb4c3a01d
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/widget/TintedImageButton.java
@@ -0,0 +1,81 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.widget;
+
+import android.content.Context;
+import android.content.res.ColorStateList;
+import android.content.res.TypedArray;
+import android.graphics.PorterDuff;
+import android.os.Build;
+import android.util.AttributeSet;
+import android.widget.ImageButton;
+
+import org.chromium.chrome.R;
+
+/**
+ * Implementation of ImageButton that allows to tint the color of the image button for all
+ * image button states using chrome:tint attribute in XML.
+ */
+public class TintedImageButton extends ImageButton {
+    private ColorStateList mTint;
+
+    public TintedImageButton(Context context) {
+        super(context);
+    }
+
+    public TintedImageButton(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init(context, attrs, 0);
+    }
+
+    public TintedImageButton(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        init(context, attrs, defStyle);
+    }
+
+    private void init(Context context, AttributeSet attrs, int defStyle) {
+        TypedArray a = context.obtainStyledAttributes(
+                attrs, R.styleable.TintedImageButton, defStyle, 0);
+        setTintInternal(a.getColorStateList(R.styleable.TintedImageButton_tint));
+        a.recycle();
+    }
+
+    @Override
+    public void setImageResource(int resId) {
+        super.setImageResource(resId);
+        // Workaround for API 21 where the image state does not get reset correctly when image
+        // resource is changed.
+        refreshDrawableState();
+    }
+
+    @Override
+    protected void drawableStateChanged() {
+        super.drawableStateChanged();
+        updateTintColor();
+    }
+
+    /**
+     * Sets the tint color for the given ImageButton for all button states.
+     * @param tint The set of colors to use to color the ImageButton.
+     */
+    public void setTint(ColorStateList tint) {
+        setTintInternal(tint);
+        updateTintColor();
+    }
+
+    private void setTintInternal(ColorStateList tint) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+            setImageTintList(tint);
+            setImageTintMode(PorterDuff.Mode.SRC_ATOP);
+        } else {
+            mTint = tint;
+        }
+    }
+
+    private void updateTintColor() {
+        if (mTint == null || !mTint.isStateful()) return;
+        setColorFilter(mTint.getColorForState(getDrawableState(), 0));
+    }
+}