Revert of Gamepad API support for chrome on android

content/browser/gamepad/gamepad_platform_data_fetcher_android.cc

-// 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.
-
-#include "content/browser/gamepad/gamepad_platform_data_fetcher_android.h"
-
-#include "base/android/jni_android.h"
-#include "base/android/jni_array.h"
-#include "base/android/jni_string.h"
-#include "base/debug/trace_event.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/string_util.h"
-#include "base/strings/utf_string_conversions.h"
-
-#include "jni/GamepadList_jni.h"
-
-#include "third_party/WebKit/public/platform/WebGamepads.h"
-
-using base::android::AttachCurrentThread;
-using base::android::CheckException;
-using base::android::ClearException;
-using base::android::ConvertJavaStringToUTF8;
-using base::android::ScopedJavaLocalRef;
-using blink::WebGamepad;
-using blink::WebGamepads;
-
-namespace content {
-
-bool
-GamepadPlatformDataFetcherAndroid::RegisterGamepadPlatformDataFetcherAndroid(
-    JNIEnv* env) {
-  return RegisterNativesImpl(env);
-}
-
-GamepadPlatformDataFetcherAndroid::GamepadPlatformDataFetcherAndroid() {
-  PauseHint(false);
-}
-
-GamepadPlatformDataFetcherAndroid::~GamepadPlatformDataFetcherAndroid() {
-  PauseHint(true);
-}
-
-void GamepadPlatformDataFetcherAndroid::GetGamepadData(
-    blink::WebGamepads* pads,
-    bool devices_changed_hint) {
-  TRACE_EVENT0("GAMEPAD", "GetGamepadData");
-
-  pads->length = 0;
-
-  JNIEnv* env = AttachCurrentThread();
-  if (!env)
-    return;
-
-  Java_GamepadList_updateGamepadData(env, reinterpret_cast<intptr_t>(pads));
-}
-
-void GamepadPlatformDataFetcherAndroid::PauseHint(bool paused) {
-  JNIEnv* env = AttachCurrentThread();
-  if (!env)
-    return;
-
-  Java_GamepadList_notifyForGamepadsAccess(env, paused);
-}
-
-static void SetGamepadData(JNIEnv* env,
-                           jobject obj,
-                           jlong gamepads,
-                           jint index,
-                           jboolean mapping,
-                           jboolean connected,
-                           jstring devicename,
-                           jlong timestamp,
-                           jfloatArray jaxes,
-                           jfloatArray jbuttons) {
-  DCHECK(gamepads);
-  blink::WebGamepads* pads = reinterpret_cast<WebGamepads*>(gamepads);
-  DCHECK_EQ(pads->length, unsigned(index));
-  DCHECK_LT(index, static_cast<int>(blink::WebGamepads::itemsLengthCap));
-
-  ++pads->length;
-
-  blink::WebGamepad& pad = pads->items[index];
-
-  pad.connected = connected;
-
-  pad.timestamp = timestamp;
-
-  // Do not set gamepad parameters for all the gamepad devices that are not
-  // attached.
-  if (!connected)
-    return;
-
-  // Map the Gamepad DeviceName String to the WebGamepad Id. Ideally it should
-  // be mapped to vendor and product information but it is only available at
-  // kernel level and it can not be queried using class
-  // android.hardware.input.InputManager.
-  // TODO(SaurabhK): Store a cached WebGamePad object in
-  // GamepadPlatformDataFetcherAndroid and only update constant WebGamepad
-  // values when a device has changed.
-  base::string16 device_name;
-  base::android::ConvertJavaStringToUTF16(env, devicename, &device_name);
-  const size_t name_to_copy =
-      std::min(device_name.size(), WebGamepad::idLengthCap - 1);
-  memcpy(pad.id,
-         device_name.data(),
-         name_to_copy * sizeof(base::string16::value_type));
-  pad.id[name_to_copy] = 0;
-
-  base::string16 mapping_name = base::UTF8ToUTF16(mapping ? "standard" : "");
-  const size_t mapping_to_copy =
-      std::min(mapping_name.size(), WebGamepad::mappingLengthCap - 1);
-  memcpy(pad.mapping,
-         mapping_name.data(),
-         mapping_to_copy * sizeof(base::string16::value_type));
-  pad.mapping[mapping_to_copy] = 0;
-
-  pad.timestamp = timestamp;
-
-  std::vector<float> axes;
-  base::android::JavaFloatArrayToFloatVector(env, jaxes, &axes);
-
-  // Set WebGamepad axeslength to total number of axes on the gamepad device.
-  // Only return the first axesLengthCap if axeslength captured by GamepadList
-  // is larger than axesLengthCap.
-  pad.axesLength = std::min(static_cast<int>(axes.size()),
-                            static_cast<int>(WebGamepad::axesLengthCap));
-
-  memcpy(pad.axes, axes.begin(), pad.axesLength * sizeof(float));
-
-  std::vector<float> buttons;
-  base::android::JavaFloatArrayToFloatVector(env, jbuttons, &buttons);
-
-  // Set WebGamepad buttonslength to total number of axes on the gamepad
-  // device. Only return the first buttonsLengthCap if axeslength captured by
-  // GamepadList is larger than buttonsLengthCap.
-  pad.buttonsLength = std::min(static_cast<int>(buttons.size()),
-                               static_cast<int>(WebGamepad::buttonsLengthCap));
-
-  // Copy buttons state to the WebGamepad buttons[].
-  for (unsigned int j = 0; j < pad.buttonsLength; j++) {
-    pad.buttons[j].pressed = buttons[j];
-    pad.buttons[j].value = buttons[j];
-  }
-}
-
-}  // namespace content