[Android] Import Android's SwipeRefreshLayout

Pull the necessary files from Android's app compat library (v4) to reuse
the SwipeRefreshLayout. This allows perfect reproduction of the
platform pull-to-refresh style while accomodating differences inherent to
Chrome's asynchonous input pipeline.

Integration of and necessary changes to this effect will be performed in
https://codereview.chromium.org/894193005/.

License reviewed per
http://www.chromium.org/developers/adding-3rd-party-libraries.

BUG=428429

Review URL: https://codereview.chromium.org/897663003

Cr-Commit-Position: refs/heads/master@{#316266}

third_party/android_swipe_refresh/BUILD.gn

+# Copyright 2015 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.
+
+import("//build/config/android/rules.gni")
+
+assert(is_android)
+
+android_library("android_swipe_refresh_java") {
+  DEPRECATED_java_in_dir = "java/src"
+  deps = [
+    "//third_party/android_tools:android_support_v4_java",
+  ]
+}

third_party/android_swipe_refresh/OWNERS

+aurimas@chromium.org
+jdduke@chromium.org
+tedchoc@chromium.org

third_party/android_swipe_refresh/README.chromium

+Name: Android Open Source Project
+URL: https://android.googlesource.com/platform/frameworks/support
+Version: unknown
+License: Apache 2.0
+Security Critical: yes
+
+Description:
+This is a modified copy of the swipe refresh layout widget (and its two
+dependencies) from Android's app compat library (v4). The widget provides a
+pull-to-refresh styled layout for touch-activated refresh of view contents.
+
+Local Modifications:
+CircleImageView, MaterialProgressDrawable, SwipeRefreshLayout:
+  * Only the package has been changed.

third_party/android_swipe_refresh/android_swipe_refresh.gyp

+# Copyright 2015 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.
+
+{
+  'variables': {
+    'chromium_code': 1,
+  },
+  'targets': [
+    {
+      'target_name': 'android_swipe_refresh_java',
+      'type': 'none',
+      'dependencies': [
+        '../../third_party/android_tools/android_tools.gyp:android_support_v4_javalib',
+      ],
+      'variables': {
+        'java_in_dir': 'java',
+      },
+      'includes': [ '../../build/java.gypi' ],
+    },
+  ],
+}

third_party/android_swipe_refresh/java/src/chromium/third_party/android/swiperefresh/CircleImageView.java

+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.chromium.third_party.android.swiperefresh;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.RadialGradient;
+import android.graphics.Shader;
+import android.graphics.drawable.ShapeDrawable;
+import android.graphics.drawable.shapes.OvalShape;
+import android.support.v4.view.ViewCompat;
+import android.view.animation.Animation;
+import android.widget.ImageView;
+
+/**
+ * Private class created to work around issues with AnimationListeners being
+ * called before the animation is actually complete and support shadows on older
+ * platforms.
+ *
+ * @hide
+ */
+class CircleImageView extends ImageView {
+
+    private static final int KEY_SHADOW_COLOR = 0x1E000000;
+    private static final int FILL_SHADOW_COLOR = 0x3D000000;
+    // PX
+    private static final float X_OFFSET = 0f;
+    private static final float Y_OFFSET = 1.75f;
+    private static final float SHADOW_RADIUS = 3.5f;
+    private static final int SHADOW_ELEVATION = 4;
+
+    private Animation.AnimationListener mListener;
+    private int mShadowRadius;
+
+    public CircleImageView(Context context, int color, final float radius) {
+        super(context);
+        final float density = getContext().getResources().getDisplayMetrics().density;
+        final int diameter = (int) (radius * density * 2);
+        final int shadowYOffset = (int) (density * Y_OFFSET);
+        final int shadowXOffset = (int) (density * X_OFFSET);
+
+        mShadowRadius = (int) (density * SHADOW_RADIUS);
+
+        ShapeDrawable circle;
+        if (elevationSupported()) {
+            circle = new ShapeDrawable(new OvalShape());
+            ViewCompat.setElevation(this, SHADOW_ELEVATION * density);
+        } else {
+            OvalShape oval = new OvalShadow(mShadowRadius, diameter);
+            circle = new ShapeDrawable(oval);
+            ViewCompat.setLayerType(this, ViewCompat.LAYER_TYPE_SOFTWARE, circle.getPaint());
+            circle.getPaint().setShadowLayer(mShadowRadius, shadowXOffset, shadowYOffset,
+                    KEY_SHADOW_COLOR);
+            final int padding = (int) mShadowRadius;
+            // set padding so the inner image sits correctly within the shadow.
+            setPadding(padding, padding, padding, padding);
+        }
+        circle.getPaint().setColor(color);
+        if(android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.JELLY_BEAN) {
+            setBackgroundDrawable(circle);
+        } else {
+            setBackground(circle);
+        }
+    }
+
+    private boolean elevationSupported() {
+        return android.os.Build.VERSION.SDK_INT >= 21;
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+        if (!elevationSupported()) {
+            setMeasuredDimension(getMeasuredWidth() + mShadowRadius*2, getMeasuredHeight()
+                    + mShadowRadius*2);
+        }
+    }
+
+    public void setAnimationListener(Animation.AnimationListener listener) {
+        mListener = listener;
+    }
+
+    @Override
+    public void onAnimationStart() {
+        super.onAnimationStart();
+        if (mListener != null) {
+            mListener.onAnimationStart(getAnimation());
+        }
+    }
+
+    @Override
+    public void onAnimationEnd() {
+        super.onAnimationEnd();
+        if (mListener != null) {
+            mListener.onAnimationEnd(getAnimation());
+        }
+    }
+
+    /**
+     * Update the background color of the circle image view.
+     */
+    public void setBackgroundColor(int colorRes) {
+        if (getBackground() instanceof ShapeDrawable) {
+            final Resources res = getResources();
+            ((ShapeDrawable) getBackground()).getPaint().setColor(res.getColor(colorRes));
+        }
+    }
+
+    private class OvalShadow extends OvalShape {
+        private RadialGradient mRadialGradient;
+        private int mShadowRadius;
+        private Paint mShadowPaint;
+        private int mCircleDiameter;
+
+        public OvalShadow(int shadowRadius, int circleDiameter) {
+            super();
+            mShadowPaint = new Paint();
+            mShadowRadius = shadowRadius;
+            mCircleDiameter = circleDiameter;
+            mRadialGradient = new RadialGradient(mCircleDiameter / 2, mCircleDiameter / 2,
+                    mShadowRadius, new int[] {
+                            FILL_SHADOW_COLOR, Color.TRANSPARENT
+                    }, null, Shader.TileMode.CLAMP);
+            mShadowPaint.setShader(mRadialGradient);
+        }
+
+        @Override
+        public void draw(Canvas canvas, Paint paint) {
+            final int viewWidth = CircleImageView.this.getWidth();
+            final int viewHeight = CircleImageView.this.getHeight();
+            canvas.drawCircle(viewWidth / 2, viewHeight / 2, (mCircleDiameter / 2 + mShadowRadius),
+                    mShadowPaint);
+            canvas.drawCircle(viewWidth / 2, viewHeight / 2, (mCircleDiameter / 2), paint);
+        }
+    }
+}