[Remoting Android] Remove old renderer code

remoting/android/java/src/org/chromium/chromoting/FeedbackAnimator.java

-// Copyright 2016 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.chromoting;
-
-import android.graphics.Color;
-import android.graphics.Paint;
-import android.graphics.Point;
-import android.graphics.RadialGradient;
-import android.graphics.Shader;
-import android.os.SystemClock;
-
-/** Helper class for displaying the press feedback animations. */
-public final class FeedbackAnimator
-        implements Event.ParameterCallback<Boolean, PaintEventParameter> {
-    /** Total duration of the animation, in milliseconds. */
-    private static final float TOTAL_DURATION_MS = 220;
-
-    /** Start time of the animation, from {@link SystemClock#uptimeMillis()}. */
-    private final long mStartTimeInMs;
-
-    /** Contains the size of the feedback animation for the most recent request. */
-    private final float mFeedbackSizeInPixels;
-
-    private final Paint mPaint = new Paint();
-
-    private final Point mPos;
-
-    private FeedbackAnimator(float feedbackSizeInPixels, Point pos) {
-        mStartTimeInMs = SystemClock.uptimeMillis();
-        mFeedbackSizeInPixels = feedbackSizeInPixels;
-        mPos = pos;
-    }
-
-    /** Begins a new animation sequence at position (|pos|). */
-    public static void startAnimation(DesktopView view,
-                                      Point pos,
-                                      float feedbackRadius) {
-        if (feedbackRadius <= 0.0f) {
-            return;
-        }
-
-        view.onPaint().addSelfRemovable(new FeedbackAnimator(feedbackRadius, pos));
-    }
-
-    @Override
-    public Boolean run(PaintEventParameter parameter) {
-        float elapsedTimeInMs = SystemClock.uptimeMillis() - mStartTimeInMs;
-        if (elapsedTimeInMs < 1) {
-            return true;
-        }
-
-        // |progress| is 0 at the beginning, 1 at the end.
-        float progress = elapsedTimeInMs / TOTAL_DURATION_MS;
-        if (progress >= 1) {
-            return false;
-        }
-
-        float size = mFeedbackSizeInPixels / parameter.scale;
-
-        // Animation grows from 0 to |size|, and goes from fully opaque to transparent for a
-        // seamless fading-out effect. The animation needs to have more than one color so it's
-        // visible over any background color.
-        float radius = size * progress;
-        int alpha = (int) ((1 - progress) * 0xff);
-
-        int transparentBlack = Color.argb(0, 0, 0, 0);
-        int white = Color.argb(alpha, 0xff, 0xff, 0xff);
-        int black = Color.argb(alpha, 0, 0, 0);
-        mPaint.setShader(new RadialGradient(mPos.x, mPos.y, radius,
-                new int[] {transparentBlack, white, black, transparentBlack},
-                new float[] {0.0f, 0.8f, 0.9f, 1.0f}, Shader.TileMode.CLAMP));
-        parameter.canvas.drawCircle(mPos.x, mPos.y, radius, mPaint);
-        return true;
-    }
-}