Add an empty Android implementation of the PhysicalWebDataSource

chrome/browser/browser_process.h

Index: chrome/browser/browser_process.h
diff --git a/chrome/browser/browser_process.h b/chrome/browser/browser_process.h
index f947509cd4ff72e573bcf15c22f77f1e81c71e5b..e7b669095bd798900fdf3c2be06e49ef239fd5e0 100644
--- a/chrome/browser/browser_process.h
+++ b/chrome/browser/browser_process.h
@@ -32,6 +32,7 @@ class IOThread;
 class MediaFileSystemRegistry;
 class NotificationPlatformBridge;
 class NotificationUIManager;
+class PhysicalWebDataSource;
 class PrefRegistrySimple;
 class PrefService;
 class Profile;
@@ -278,6 +279,9 @@ class BrowserProcess {
   virtual shell_integration::DefaultWebClientState
   CachedDefaultWebClientState() = 0;
 
+  // Returns the Physical Web data source.
+  virtual PhysicalWebDataSource* GetPhysicalWebDataSource() = 0;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(BrowserProcess);
 };