[sensors] Add Permission guard to the generic sensor apis.

third_party/WebKit/Source/modules/sensor/Sensor.cpp

Index: third_party/WebKit/Source/modules/sensor/Sensor.cpp
diff --git a/third_party/WebKit/Source/modules/sensor/Sensor.cpp b/third_party/WebKit/Source/modules/sensor/Sensor.cpp
index 60551e7edd45e22c1090aaf8f1f05beec2d6fa4a..d8b3f6132dd2319b35f2794caac67c1db26d332b 100644
--- a/third_party/WebKit/Source/modules/sensor/Sensor.cpp
+++ b/third_party/WebKit/Source/modules/sensor/Sensor.cpp
@@ -167,8 +167,11 @@ void Sensor::initSensorProxyIfNeeded() {
   m_sensorProxy = provider->getSensor(m_type);
 
   if (!m_sensorProxy) {
-    m_sensorProxy =
-        provider->createSensor(m_type, createSensorReadingFactory());
+    m_sensorProxy = provider->createSensor(m_type, getExecutionContext(),
+                                           createSensorReadingFactory());
+    // check if proxy was created correctly.
+    if (!m_sensorProxy)

[shalamov, 2016/11/18 13:17:45]

This is sync operation that is initiated from Sensor::start, so, start will
throw exception (InvalidStateError) and this check will throw async error
NotAllowedError. Looks strange, can we just throw one exception?

[riju_, 2016/11/21 11:23:28]

Done.

+      reportError(NotAllowedError, "Could not create sensor proxy.");
   }
 }