Gamepad API support for chrome on android

content/renderer/gamepad_shared_memory_reader.cc

 // Copyright (c) 2012 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/renderer/gamepad_shared_memory_reader.h"
 
 #include "base/debug/trace_event.h"
 #include "base/metrics/histogram.h"
 #include "content/common/gamepad_messages.h"
 #include "content/common/gamepad_user_gesture.h"
@@ skipping 17 matching lines @@
     return;
   renderer_shared_memory_.reset(
       new base::SharedMemory(renderer_shared_memory_handle_, true));
   CHECK(renderer_shared_memory_->Map(sizeof(GamepadHardwareBuffer)));
   void *memory = renderer_shared_memory_->memory();
   CHECK(memory);
   gamepad_hardware_buffer_ =
       static_cast<GamepadHardwareBuffer*>(memory);
 }
 
+void GamepadSharedMemoryReader::ResumeGamepads() {
+  RenderThread::Get()->Send(new GamepadHostMsg_ResumePolling());
+}
+
+void GamepadSharedMemoryReader::PauseGamepads() {
+  RenderThread::Get()->Send(new GamepadHostMsg_PausePolling());
+}
+
 void GamepadSharedMemoryReader::SampleGamepads(blink::WebGamepads& gamepads) {
   // ==========
   //   DANGER
   // ==========
   //
   // This logic is duplicated in Pepper as well. If you change it, that also
   // needs to be in sync. See ppapi/proxy/gamepad_resource.cc.
   blink::WebGamepads read_into;
   TRACE_EVENT0("GAMEPAD", "SampleGamepads");
 
   if (!base::SharedMemory::IsHandleValid(renderer_shared_memory_handle_))
     return;
 
   // Only try to read this many times before failing to avoid waiting here
   // very long in case of contention with the writer. TODO(scottmg) Tune this
   // number (as low as 1?) if histogram shows distribution as mostly
   // 0-and-maximum.
   const int kMaximumContentionCount = 10;
   int contention_count = -1;
   base::subtle::Atomic32 version;
+  // Update the timestamp for Gamepad Data access by the consumer
+  RenderThread::Get()->Send(new GamepadHostMsg_UpdateTimestamp());
   do {
     version = gamepad_hardware_buffer_->sequence.ReadBegin();
     memcpy(&read_into, &gamepad_hardware_buffer_->buffer, sizeof(read_into));
     ++contention_count;
     if (contention_count == kMaximumContentionCount)
       break;
   } while (gamepad_hardware_buffer_->sequence.ReadRetry(version));
   UMA_HISTOGRAM_COUNTS("Gamepad.ReadContentionCount", contention_count);
 
   if (contention_count >= kMaximumContentionCount) {
@@ skipping 18 matching lines @@
         gamepads.items[i].connected = false;
     }
   }
 }
 
 GamepadSharedMemoryReader::~GamepadSharedMemoryReader() {
   RenderThread::Get()->Send(new GamepadHostMsg_StopPolling());
 }
 
 } // namespace content