[DeviceLight API] Content Side

content/browser/device_orientation/data_fetcher_shared_memory_default.cc

Index: content/browser/device_orientation/data_fetcher_shared_memory_default.cc
diff --git a/content/browser/device_orientation/data_fetcher_shared_memory_default.cc b/content/browser/device_orientation/data_fetcher_shared_memory_default.cc
index ce7b5676e6686ad75d4f5cb4299aaca634a50767..f2dfb299a33ff45f4ac30dc57be7917c18ee7fcb 100644
--- a/content/browser/device_orientation/data_fetcher_shared_memory_default.cc
+++ b/content/browser/device_orientation/data_fetcher_shared_memory_default.cc
@@ -9,6 +9,15 @@
 
 namespace {
 
+static bool SetLightBuffer(content::DeviceLightHardwareBuffer* buffer,
+    bool enabled) {
+  if (!buffer)
+    return false;
+  buffer->seqlock.WriteBegin();
+  buffer->seqlock.WriteEnd();
+  return true;
+}
+
 static bool SetMotionBuffer(content::DeviceMotionHardwareBuffer* buffer,
     bool enabled) {
   if (!buffer)
@@ -29,12 +38,12 @@ static bool SetOrientationBuffer(
   return true;
 }
 
-}
+}  // namespace
 
 namespace content {
 
 DataFetcherSharedMemory::DataFetcherSharedMemory()
-    : motion_buffer_(NULL), orientation_buffer_(NULL) {
+    : light_buffer_(NULL), motion_buffer_(NULL), orientation_buffer_(NULL) {
 }
 
 DataFetcherSharedMemory::~DataFetcherSharedMemory() {
@@ -44,6 +53,10 @@ bool DataFetcherSharedMemory::Start(ConsumerType consumer_type, void* buffer) {
   DCHECK(buffer);
 
   switch (consumer_type) {
+    case CONSUMER_TYPE_LIGHT:
+      light_buffer_ = static_cast<DeviceLightHardwareBuffer*>(buffer);
+      UMA_HISTOGRAM_BOOLEAN("InertialSensor.LightDefaultAvailable", false);
+      return SetLightBuffer(light_buffer_, true);
     case CONSUMER_TYPE_MOTION:
       motion_buffer_ = static_cast<DeviceMotionHardwareBuffer*>(buffer);
       UMA_HISTOGRAM_BOOLEAN("InertialSensor.MotionDefaultAvailable", false);
@@ -61,8 +74,9 @@ bool DataFetcherSharedMemory::Start(ConsumerType consumer_type, void* buffer) {
 }
 
 bool DataFetcherSharedMemory::Stop(ConsumerType consumer_type) {
-
   switch (consumer_type) {
+    case CONSUMER_TYPE_LIGHT:
+      return SetLightBuffer(light_buffer_, false);
     case CONSUMER_TYPE_MOTION:
       return SetMotionBuffer(motion_buffer_, false);
     case CONSUMER_TYPE_ORIENTATION: