Add an empty Android implementation of the PhysicalWebDataSource

chrome/browser/browser_process_impl.cc

Index: chrome/browser/browser_process_impl.cc
diff --git a/chrome/browser/browser_process_impl.cc b/chrome/browser/browser_process_impl.cc
index 3d002dad6f012a3bcbe1518e242a79e8630b9a7b..ba3e4ec0585f5601b2f1e3ad0489025b3258222c 100644
--- a/chrome/browser/browser_process_impl.cc
+++ b/chrome/browser/browser_process_impl.cc
@@ -91,6 +91,7 @@
 #include "components/metrics_services_manager/metrics_services_manager.h"
 #include "components/net_log/chrome_net_log.h"
 #include "components/network_time/network_time_tracker.h"
+#include "components/physical_web/data_source/physical_web_data_source.h"
 #include "components/policy/core/browser/browser_policy_connector.h"
 #include "components/policy/core/common/policy_service.h"
 #include "components/prefs/json_pref_store.h"
@@ -169,6 +170,10 @@
 #include "chrome/browser/first_run/upgrade_util.h"
 #endif
 
+#if defined(OS_ANDROID)
+#include "chrome/browser/android/physical_web/physical_web_data_source_android.h"
+#endif
+
 #if (defined(OS_WIN) || defined(OS_LINUX)) && !defined(OS_CHROMEOS)
 // How often to check if the persistent instance of Chrome needs to restart
 // to install an update.
@@ -780,6 +785,19 @@ BrowserProcessImpl::CachedDefaultWebClientState() {
   return cached_default_web_client_state_;
 }
 
+PhysicalWebDataSource* BrowserProcessImpl::GetPhysicalWebDataSource() {
+  DCHECK(CalledOnValidThread());
+#if defined(OS_ANDROID)
+  if (!physical_web_data_source_) {
+    CreatePhysicalWebDataSource();
+    DCHECK(physical_web_data_source_);
+  }
+  return physical_web_data_source_.get();
+#else
+  return nullptr;
+#endif
+}
+
 // static
 void BrowserProcessImpl::RegisterPrefs(PrefRegistrySimple* registry) {
   registry->RegisterBooleanPref(prefs::kDefaultBrowserSettingEnabled,
@@ -1203,6 +1221,16 @@ void BrowserProcessImpl::CreateGCMDriver() {
 #endif  // defined(OS_ANDROID)
 }
 
+void BrowserProcessImpl::CreatePhysicalWebDataSource() {
+  DCHECK(!physical_web_data_source_);
+
+#if defined(OS_ANDROID)
+  physical_web_data_source_ = base::MakeUnique<PhysicalWebDataSourceAndroid>();
+#else
+  NOTIMPLEMENTED();
+#endif
+}
+
 void BrowserProcessImpl::ApplyDefaultBrowserPolicy() {
   if (local_state()->GetBoolean(prefs::kDefaultBrowserSettingEnabled)) {
     // The worker pointer is reference counted. While it is running, the