Add content API for requesting the current geolocation

content/browser/geolocation/geolocation.cc

Index: content/browser/geolocation/geolocation.cc
diff --git a/content/browser/geolocation/geolocation.cc b/content/browser/geolocation/geolocation.cc
index 920ab3130d978aee16f381eea4e4c28fc37ff391..b029a6c1b2328b25b24e083cbf9608b249c7ddf6 100644
--- a/content/browser/geolocation/geolocation.cc
+++ b/content/browser/geolocation/geolocation.cc
@@ -7,6 +7,7 @@
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/location.h"
+#include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop_proxy.h"
 #include "content/browser/geolocation/geolocation_provider.h"
@@ -21,10 +22,33 @@ void OverrideLocationForTestingOnIOThread(
     const Geoposition& position,
     const base::Closure& completion_callback,
     scoped_refptr<base::MessageLoopProxy> callback_loop) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   GeolocationProvider::GetInstance()->OverrideLocationForTesting(position);
   callback_loop->PostTask(FROM_HERE, completion_callback);
 }
 
+void GeolocationUpdateCallbackOnIOThread(
+    const GeolocationUpdateCallback& client_callback,
+    scoped_refptr<base::MessageLoopProxy> client_loop,
+    const Geoposition& position) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  if (base::MessageLoopProxy::current() != client_loop)
+    client_loop->PostTask(FROM_HERE, base::Bind(client_callback, position));
+  else
+    client_callback.Run(position);
+}
+
+void RequestLocationUpdateOnIOThread(
+    const GeolocationUpdateCallback& client_callback,
+    scoped_refptr<base::MessageLoopProxy> client_loop) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  GeolocationUpdateCallback io_thread_callback = base::Bind(
+      &GeolocationUpdateCallbackOnIOThread,
+      client_callback,
+      client_loop);
+  GeolocationProvider::GetInstance()->RequestCallback(io_thread_callback);
+}
+
 }  // namespace
 
 void OverrideLocationForTesting(
@@ -41,4 +65,14 @@ void OverrideLocationForTesting(
   }
 }
 
+void RequestLocationUpdate(const GeolocationUpdateCallback& callback) {
+  base::Closure closure = base::Bind(&RequestLocationUpdateOnIOThread,
+                                     callback,
+                                     base::MessageLoopProxy::current());
+  if (!BrowserThread::CurrentlyOn(BrowserThread::IO))
+    BrowserThread::PostTask(BrowserThread::IO, FROM_HERE, closure);
+  else
+    closure.Run();
+}
+
 }  // namespace content