Restructure contents of blimp/client.

blimp/client/android/java/src/org/chromium/blimp/session/TabControlFeature.java

-// 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.
-
-package org.chromium.blimp.session;
-
-import android.view.View;
-
-import org.chromium.base.annotations.JNINamespace;
-
-/**
- * A Java representation of the native ControlFeature class.  Provides easy access for Java control
- * UI to interact with the native content-lite feature proxy and talk to the engine.
- */
-@JNINamespace("blimp::client")
-public class TabControlFeature implements View.OnLayoutChangeListener {
-    private final float mDpToPx;
-
-    private View mContentAreaView;
-    private long mNativeTabControlFeatureAndroidPtr;
-
-    /**
-     * Creates an instance of a {@link TabControlFeature}.  This will register with
-     * {@code contentAreaView} as a {@link android.view.View.OnLayoutChangeListener} and will
-     * unregister when {@link #destroy()} is called.
-     * @param blimpClientSession The {@link BlimpClientSession} that contains the content-lite
-     *                           features required by the native components of the
-     *                           {@link TabControlFeature}.
-     * @param contentAreaView    A {@link View} that represents the content area of the screen.
-     *                           This is used to notify the engine of the correct size of the web
-     *                           content area.
-     */
-    public TabControlFeature(BlimpClientSession blimpClientSession, View contentAreaView) {
-        mContentAreaView = contentAreaView;
-        mContentAreaView.addOnLayoutChangeListener(this);
-        mDpToPx = mContentAreaView.getContext().getResources().getDisplayMetrics().density;
-        mNativeTabControlFeatureAndroidPtr = nativeInit(blimpClientSession);
-
-        // Push down the current size of the content area view.
-        nativeOnContentAreaSizeChanged(mNativeTabControlFeatureAndroidPtr,
-                mContentAreaView.getWidth(), mContentAreaView.getHeight(), mDpToPx);
-    }
-
-    /**
-     * Tears down the native counterpart to this class and unregisters any {@link View} listeners.
-     * This class should not be used after this.
-     */
-    public void destroy() {
-        if (mContentAreaView != null) {
-            mContentAreaView.removeOnLayoutChangeListener(this);
-            mContentAreaView = null;
-        }
-
-        if (mNativeTabControlFeatureAndroidPtr != 0) {
-            nativeDestroy(mNativeTabControlFeatureAndroidPtr);
-            mNativeTabControlFeatureAndroidPtr = 0;
-        }
-    }
-
-    // View.OnLayoutChangeListener implementation.
-    @Override
-    public void onLayoutChange(View v, int left, int top, int right, int bottom,
-            int oldLeft, int oldTop, int oldRight, int oldBottom) {
-        if (mNativeTabControlFeatureAndroidPtr == 0) return;
-        nativeOnContentAreaSizeChanged(mNativeTabControlFeatureAndroidPtr, right - left,
-                bottom - top, mDpToPx);
-    }
-
-    private native long nativeInit(BlimpClientSession blimpClientSession);
-    private native void nativeDestroy(long nativeTabControlFeatureAndroid);
-    private native void nativeOnContentAreaSizeChanged(
-            long nativeTabControlFeatureAndroid, int width, int height, float dpToPx);
-}