bluetooth: Disconnect if the page becomes hidden or is closed.

third_party/WebKit/Source/modules/bluetooth/BluetoothDevice.cpp

Index: third_party/WebKit/Source/modules/bluetooth/BluetoothDevice.cpp
diff --git a/third_party/WebKit/Source/modules/bluetooth/BluetoothDevice.cpp b/third_party/WebKit/Source/modules/bluetooth/BluetoothDevice.cpp
index 9277df92745234fdef93a5f8b60f4bcb26df2b5c..aad96d3c2215291969bd89ee1c6ca1162059f914 100644
--- a/third_party/WebKit/Source/modules/bluetooth/BluetoothDevice.cpp
+++ b/third_party/WebKit/Source/modules/bluetooth/BluetoothDevice.cpp
@@ -8,13 +8,23 @@
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/dom/DOMException.h"
+#include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
+#include "core/page/PageVisibilityState.h"
 #include "modules/bluetooth/BluetoothError.h"
 #include "modules/bluetooth/BluetoothGATTRemoteServer.h"
 #include "modules/bluetooth/BluetoothSupplement.h"
 #include "public/platform/modules/bluetooth/WebBluetooth.h"
 
 namespace blink {
+namespace {
+
+PageVisibilityState getPageVisibilityState(ScriptState* scriptState)
+{
+    return toDocument(scriptState->executionContext())->page()->visibilityState();
+}
+
+} // namespace
 
 BluetoothDevice::BluetoothDevice(PassOwnPtr<WebBluetoothDevice> webDevice)
     : m_webDevice(webDevice)
@@ -79,6 +89,13 @@ Vector<String> BluetoothDevice::uuids()
 
 ScriptPromise BluetoothDevice::connectGATT(ScriptState* scriptState)
 {
+    // TODO(ortuno): Allow connections when the tab is in the background.
+    // This is a short term solution instead of implementing a tab indicator
+    // for bluetooth connections.
+    // https://crbug.com/579746
+    if (getPageVisibilityState(scriptState) != PageVisibilityStateVisible) {
+        return ScriptPromise::rejectWithDOMException(scriptState, DOMException::create(SecurityError, "Connection is only allowed while the page is visible. This is a temporary measure until we are able to effectively communicate to the user that a page is connected to a device."));
+    }
     WebBluetooth* webbluetooth = BluetoothSupplement::fromScriptState(scriptState);
     if (!webbluetooth)
         return ScriptPromise::rejectWithDOMException(scriptState, DOMException::create(NotSupportedError));