[DeviceLight] Browser+java part

content/browser/device_sensors/data_fetcher_shared_memory_default.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 "data_fetcher_shared_memory.h"
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 
 namespace {
@@ skipping 11 matching lines @@
 static bool SetOrientationBuffer(
     content::DeviceOrientationHardwareBuffer* buffer, bool enabled) {
   if (!buffer)
     return false;
   buffer->seqlock.WriteBegin();
   buffer->data.allAvailableSensorsAreActive = enabled;
   buffer->seqlock.WriteEnd();
   return true;
 }
 
+static bool SetLightBuffer(content::DeviceLightHardwareBuffer* buffer,
+                           double lux) {
+  if (!buffer)
+    return false;
+  buffer->seqlock.WriteBegin();
+  buffer->data.value = lux;
+  buffer->seqlock.WriteEnd();
+  return true;
+}
+
 }  // namespace
 
 namespace content {
 
 DataFetcherSharedMemory::DataFetcherSharedMemory()
-    : motion_buffer_(NULL), orientation_buffer_(NULL) {
+    : motion_buffer_(NULL), orientation_buffer_(NULL), light_buffer_(NULL) {
 }
 
 DataFetcherSharedMemory::~DataFetcherSharedMemory() {
 }
 
 bool DataFetcherSharedMemory::Start(ConsumerType consumer_type, void* buffer) {
   DCHECK(buffer);
 
   switch (consumer_type) {
     case CONSUMER_TYPE_MOTION:
       motion_buffer_ = static_cast<DeviceMotionHardwareBuffer*>(buffer);
       UMA_HISTOGRAM_BOOLEAN("InertialSensor.MotionDefaultAvailable", false);
       return SetMotionBuffer(motion_buffer_, true);
     case CONSUMER_TYPE_ORIENTATION:
       orientation_buffer_ =
           static_cast<DeviceOrientationHardwareBuffer*>(buffer);
       UMA_HISTOGRAM_BOOLEAN("InertialSensor.OrientationDefaultAvailable",
           false);
       return SetOrientationBuffer(orientation_buffer_, true);
+    case CONSUMER_TYPE_LIGHT:
+      light_buffer_ = static_cast<DeviceLightHardwareBuffer*>(buffer);
+      return SetLightBuffer(light_buffer_,
+                            std::numeric_limits<double>::infinity());
     default:
       NOTREACHED();
   }
   return false;
 }
 
 bool DataFetcherSharedMemory::Stop(ConsumerType consumer_type) {
   switch (consumer_type) {
     case CONSUMER_TYPE_MOTION:
       return SetMotionBuffer(motion_buffer_, false);
     case CONSUMER_TYPE_ORIENTATION:
       return SetOrientationBuffer(orientation_buffer_, false);
+    case CONSUMER_TYPE_LIGHT:
+      return SetLightBuffer(light_buffer_, -1);
     default:
       NOTREACHED();
   }
   return false;
 }
 
 }  // namespace content