CastCore: CastRuntimeService: Add API to request CastWebService

Add a method to request a pointer to CastWebService instance.
This is required to provide access to CastWebService::* methods
in underlying classes, such as
    CastWebService::GetURLLoaderThrottleDelegateForSession()
can be needed in
    ContentBrowserClient::CreateURLLoaderThrottles().

Bug: b/203010197(internal)
Test: N/A
Signed-off-by: Volodymyr Riazantsev <riazantsevv@google.com>
Change-Id: I9124762b817767f834b281eb18afbeb840d70bc3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3230239
Reviewed-by: Ryan Keane <rwkeane@google.com>
Cr-Commit-Position: refs/heads/main@{#933552}

chromecast/cast_core/cast_runtime_service.cc

@@ -23,6 +23,10 @@ receiver::MediaManager* CastRuntimeService::GetMediaManager() {
   return nullptr;
 }
 
+CastWebService* CastRuntimeService::GetCastWebService() {
+  return nullptr;
+}
+
 void CastRuntimeService::InitializeInternal() {}
 
 void CastRuntimeService::FinalizeInternal() {}

chromecast/cast_core/cast_runtime_service.h

@@ -31,6 +31,7 @@ namespace chromecast {
 
 class CastWindowManager;
 class WebCryptoServer;
+class CastWebService;
 
 namespace media {
 class MediaPipelineBackendManager;
@@ -66,6 +67,9 @@ class CastRuntimeService
 
   virtual WebCryptoServer* GetWebCryptoServer();
   virtual receiver::MediaManager* GetMediaManager();
+  // Returns a pointer to CastWebService object with lifespan
+  // equal to CastRuntimeService main object.
+  virtual CastWebService* GetCastWebService();
 
   // CastService overrides.
   void InitializeInternal() override;

chromecast/cast_core/cast_runtime_service_impl.cc

@@ -63,4 +63,8 @@ const std::string& CastRuntimeServiceImpl::GetAudioChannelEndpoint() {
   return app_dispatcher_.GetCastMediaServiceGrpcEndpoint();
 }
 
+CastWebService* CastRuntimeServiceImpl::GetCastWebService() {
+  return app_dispatcher_.GetCastWebService();
+}
+
 }  // namespace chromecast

chromecast/cast_core/cast_runtime_service_impl.h

@@ -37,6 +37,7 @@ class CastRuntimeServiceImpl
   void StartInternal() override;
   void StopInternal() override;
   const std::string& GetAudioChannelEndpoint() override;
+  CastWebService* GetCastWebService() override;
 
  protected:
   // CastRuntimeMetricsRecorder::EventBuilderFactory overrides.

chromecast/cast_core/runtime_application_dispatcher.h

@@ -68,6 +68,7 @@ class RuntimeApplicationDispatcher final : public GrpcServer,
       GrpcMethod* callback) override;
 
   const std::string& GetCastMediaServiceGrpcEndpoint() const;
+  CastWebService* GetCastWebService() const { return web_service_.get(); }
 
  private:
   // This class handles asynchronously calling MetricsRecorderService->Record