Add Settings[, Oberser] java code and JNI bridge.

blimp/client/core/context/blimp_client_context_impl.cc

Index: blimp/client/core/context/blimp_client_context_impl.cc
diff --git a/blimp/client/core/context/blimp_client_context_impl.cc b/blimp/client/core/context/blimp_client_context_impl.cc
index 7277f1ab6521bbcc13cd7e4189d3f7cfadf3c126..a17b24856a26f89e321de943adabf4e6318d4dc1 100644
--- a/blimp/client/core/context/blimp_client_context_impl.cc
+++ b/blimp/client/core/context/blimp_client_context_impl.cc
@@ -35,6 +35,7 @@
 
 #if defined(OS_ANDROID)
 #include "blimp/client/core/context/android/blimp_client_context_impl_android.h"
+#include "blimp/client/core/settings/android/settings_android.h"
 #endif  // OS_ANDROID
 
 namespace blimp {
@@ -62,13 +63,15 @@ BlimpClientContext* BlimpClientContext::Create(
     std::unique_ptr<CompositorDependencies> compositor_dependencies,
     PrefService* local_state) {
 #if defined(OS_ANDROID)
+  auto settings = base::MakeUnique<SettingsAndroid>(local_state);

[David Trainor- moved to gerrit, 2016/11/07 18:30:58]

Maybe just inline this?  I'm fine either way though.

[Menglin, 2016/11/07 19:11:55]

i'll just keep it this way then :)

   return new BlimpClientContextImplAndroid(
       io_thread_task_runner, file_thread_task_runner,
-      std::move(compositor_dependencies), local_state);
+      std::move(compositor_dependencies), std::move(settings));
 #else
+  auto settings = base::MakeUnique<Settings>(local_state);
   return new BlimpClientContextImpl(
       io_thread_task_runner, file_thread_task_runner,
-      std::move(compositor_dependencies), local_state);
+      std::move(compositor_dependencies), std::move(settings));
 #endif  // defined(OS_ANDROID)
 }
 
@@ -94,14 +97,14 @@ BlimpClientContextImpl::BlimpClientContextImpl(
     scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> file_thread_task_runner,
     std::unique_ptr<CompositorDependencies> compositor_dependencies,
-    PrefService* local_state)
+    std::unique_ptr<Settings> settings)
     : BlimpClientContext(),
       io_thread_task_runner_(io_thread_task_runner),
       file_thread_task_runner_(file_thread_task_runner),
       blimp_compositor_dependencies_(
           base::MakeUnique<BlimpCompositorDependencies>(
               std::move(compositor_dependencies))),
-      settings_(base::MakeUnique<Settings>(local_state)),
+      settings_(std::move(settings)),
       blob_channel_feature_(new BlobChannelFeature(this)),
       geolocation_feature_(base::MakeUnique<GeolocationFeature>(
           base::MakeUnique<device::LocationArbitrator>(