Revert of Android: Move CameraStatistics from API to src

webrtc/sdk/android/src/java/org/webrtc/CameraStatistics.java

Index: webrtc/sdk/android/src/java/org/webrtc/CameraStatistics.java
diff --git a/webrtc/sdk/android/src/java/org/webrtc/CameraStatistics.java b/webrtc/sdk/android/src/java/org/webrtc/CameraStatistics.java
deleted file mode 100644
index 773a2259d915d1cb9a39b04f01424874a58deb1c..0000000000000000000000000000000000000000
--- a/webrtc/sdk/android/src/java/org/webrtc/CameraStatistics.java
+++ /dev/null
@@ -1,80 +0,0 @@
-/*
- *  Copyright 2017 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-package org.webrtc;
-
-/**
- * Helper class to log framerate and detect if the camera freezes. It will run periodic callbacks
- * on the SurfaceTextureHelper thread passed in the ctor, and should only be operated from that
- * thread.
- */
-class CameraStatistics {
-  private final static String TAG = "CameraStatistics";
-  private final static int CAMERA_OBSERVER_PERIOD_MS = 2000;
-  private final static int CAMERA_FREEZE_REPORT_TIMOUT_MS = 4000;
-
-  private final SurfaceTextureHelper surfaceTextureHelper;
-  private final CameraVideoCapturer.CameraEventsHandler eventsHandler;
-  private int frameCount;
-  private int freezePeriodCount;
-  // Camera observer - monitors camera framerate. Observer is executed on camera thread.
-  private final Runnable cameraObserver = new Runnable() {
-    @Override
-    public void run() {
-      final int cameraFps = Math.round(frameCount * 1000.0f / CAMERA_OBSERVER_PERIOD_MS);
-      Logging.d(TAG, "Camera fps: " + cameraFps + ".");
-      if (frameCount == 0) {
-        ++freezePeriodCount;
-        if (CAMERA_OBSERVER_PERIOD_MS * freezePeriodCount >= CAMERA_FREEZE_REPORT_TIMOUT_MS
-            && eventsHandler != null) {
-          Logging.e(TAG, "Camera freezed.");
-          if (surfaceTextureHelper.isTextureInUse()) {
-            // This can only happen if we are capturing to textures.
-            eventsHandler.onCameraFreezed("Camera failure. Client must return video buffers.");
-          } else {
-            eventsHandler.onCameraFreezed("Camera failure.");
-          }
-          return;
-        }
-      } else {
-        freezePeriodCount = 0;
-      }
-      frameCount = 0;
-      surfaceTextureHelper.getHandler().postDelayed(this, CAMERA_OBSERVER_PERIOD_MS);
-    }
-  };
-
-  public CameraStatistics(SurfaceTextureHelper surfaceTextureHelper,
-      CameraVideoCapturer.CameraEventsHandler eventsHandler) {
-    if (surfaceTextureHelper == null) {
-      throw new IllegalArgumentException("SurfaceTextureHelper is null");
-    }
-    this.surfaceTextureHelper = surfaceTextureHelper;
-    this.eventsHandler = eventsHandler;
-    this.frameCount = 0;
-    this.freezePeriodCount = 0;
-    surfaceTextureHelper.getHandler().postDelayed(cameraObserver, CAMERA_OBSERVER_PERIOD_MS);
-  }
-
-  private void checkThread() {
-    if (Thread.currentThread() != surfaceTextureHelper.getHandler().getLooper().getThread()) {
-      throw new IllegalStateException("Wrong thread");
-    }
-  }
-
-  public void addFrame() {
-    checkThread();
-    ++frameCount;
-  }
-
-  public void release() {
-    surfaceTextureHelper.getHandler().removeCallbacks(cameraObserver);
-  }
-}