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..878f41d6accf7c3f0173689d2756a5e787b861f2
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/widget/TintedImageButton.java
@@ -0,0 +1,58 @@
+// 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.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 {

[David Trainor- moved to gerrit, 2014/10/27 23:58:59]

It looks like Android supports this by default with V21
(ImageView#setImageTintList(), not sure if it's exactly what you want though). 
Should we try to detect the version and use their APIs depending on the version
of the OS?  Do they have something like this in their compat library?

[aurimas (slooooooooow), 2014/10/28 18:11:16]

They do not have an appcompat version. This is essentially it. Updated to use
setImageTintList for API 21 and above.

+    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);
+        mTint = a.getColorStateList(R.styleable.TintedImageButton_tint);
+        a.recycle();
+    }
+
+    @Override
+    protected void drawableStateChanged() {
+        super.drawableStateChanged();
+        if (mTint != null && mTint.isStateful()) updateTintColor();
+    }
+
+    public void setColorFilter(ColorStateList tint) {
+        this.mTint = tint;

[David Trainor- moved to gerrit, 2014/10/27 23:58:59]

remove "this."

[aurimas (slooooooooow), 2014/10/28 18:11:16]

Done.

+        super.setColorFilter(tint.getColorForState(getDrawableState(), 0));

[David Trainor- moved to gerrit, 2014/10/27 23:58:59]

call updateTintColor() here?

[aurimas (slooooooooow), 2014/10/28 18:11:16]

Done.

+    }
+
+    private void updateTintColor() {
+        int color = mTint.getColorForState(getDrawableState(), 0);

[David Trainor- moved to gerrit, 2014/10/27 23:58:59]

Remove temporary variable

[aurimas (slooooooooow), 2014/10/28 18:11:16]

Done.

+        setColorFilter(color);
+    }
+}