Add a mechanism to pause and resume geolocation requests.

content/browser/android/content_view_core_impl.cc

Index: content/browser/android/content_view_core_impl.cc
diff --git a/content/browser/android/content_view_core_impl.cc b/content/browser/android/content_view_core_impl.cc
index 474e99536851d6b9c8e2de9aa1644b96243cda30..f5861923405f31e29dadd3183c57ee5a2117ca7f 100644
--- a/content/browser/android/content_view_core_impl.cc
+++ b/content/browser/android/content_view_core_impl.cc
@@ -13,6 +13,7 @@
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/synchronization/waitable_event.h"
 #include "base/values.h"
 #include "cc/layers/layer.h"
 #include "cc/output/begin_frame_args.h"
@@ -107,7 +108,17 @@ ScopedJavaLocalRef<jobject> CreateJavaRect(
                                       static_cast<int>(rect.y()),
                                       static_cast<int>(rect.right()),
                                       static_cast<int>(rect.bottom())));
-};
+}
+
+void IsGeolocationActiveForTestingOnIOThread(
+    scoped_refptr<GeolocationDispatcherHost> d,
+    base::WaitableEvent* completion,
+    bool* result) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  *result = d->IsGeolocationActive();
+  completion->Signal();
+}
+
 }  // namespace
 
 // Enables a callback when the underlying WebContents is destroyed, to enable
@@ -173,7 +184,8 @@ ContentViewCoreImpl::ContentViewCoreImpl(JNIEnv* env, jobject obj,
           kDefaultVSyncIntervalMicros * kDefaultBrowserCompositeVSyncFraction)),
       view_android_(view_android),
       window_android_(window_android),
-      device_orientation_(0) {
+      device_orientation_(0),
+      geolocation_needs_pause_(false) {
   CHECK(web_contents) <<
       "A ContentViewCoreImpl should be created with a valid WebContents.";
 
@@ -258,6 +270,8 @@ void ContentViewCoreImpl::Observe(int type,
         }
       }
       SetFocusInternal(HasFocus());
+      if (geolocation_needs_pause_)
+        PauseOrResumeGeolocation(true);
       break;
     }
     case NOTIFICATION_RENDERER_PROCESS_CREATED: {
@@ -343,6 +357,26 @@ void ContentViewCoreImpl::PauseVideo() {
     host->Send(new ViewMsg_PauseVideo(host->GetRoutingID()));
 }
 
+void ContentViewCoreImpl::PauseOrResumeGeolocation(bool should_pause) {
+  geolocation_needs_pause_ = should_pause;
+  RenderViewHostImpl* rvh =
+      static_cast<RenderViewHostImpl*>(web_contents_->GetRenderViewHost());
+  if (rvh) {
+    scoped_refptr<GeolocationDispatcherHost> geolocation_dispatcher =
+        static_cast<RenderProcessHostImpl*>(
+            web_contents_->GetRenderProcessHost())->
+            geolocation_dispatcher_host();
+    if (geolocation_dispatcher.get()) {
+      BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
+          base::Bind(&GeolocationDispatcherHost::PauseOrResume,
+          geolocation_dispatcher,
+          rvh->GetRoutingID(),
+          should_pause));
+      geolocation_needs_pause_ = false;
+    }
+  }
+}
+
 void ContentViewCoreImpl::OnTabCrashed() {
   JNIEnv* env = AttachCurrentThread();
   ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
@@ -1627,6 +1661,29 @@ void ContentViewCoreImpl::SendOrientationChangeEventInternal() {
   rvhi->SendOrientationChangeEvent(device_orientation_);
 }
 
+bool ContentViewCoreImpl::IsGeolocationActiveForTesting(JNIEnv* env,
+                                                        jobject obj) {
+  RenderViewHostImpl* rvh =
+      static_cast<RenderViewHostImpl*>(web_contents_->GetRenderViewHost());
+  if (rvh) {
+    scoped_refptr<GeolocationDispatcherHost> geolocation_dispatcher =
+        static_cast<RenderProcessHostImpl*>(
+            web_contents_->GetRenderProcessHost())->
+            geolocation_dispatcher_host();
+    if (geolocation_dispatcher.get()) {
+      bool result = false;
+      base::WaitableEvent completion(false, false);
+      BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
+          base::Bind(IsGeolocationActiveForTestingOnIOThread,
+          geolocation_dispatcher, &completion, &result));
+      completion.Wait();
+      return result;
+    }
+  }
+
+  return false;
+}
+
 // This is called for each ContentView.
 jlong Init(JNIEnv* env, jobject obj,
            jboolean hardware_accelerated,