[ios] Adds BrandedImageProvider and its associated image resources.

ios/public/provider/chrome/browser/chrome_browser_provider.h

Index: ios/public/provider/chrome/browser/chrome_browser_provider.h
diff --git a/ios/public/provider/chrome/browser/chrome_browser_provider.h b/ios/public/provider/chrome/browser/chrome_browser_provider.h
index f028e8e9ca8fcbcf3313234946500fbc877716f4..a99c61db4b70ad14ab36062183b0fd29f3b7ed0c 100644
--- a/ios/public/provider/chrome/browser/chrome_browser_provider.h
+++ b/ios/public/provider/chrome/browser/chrome_browser_provider.h
@@ -19,6 +19,7 @@
 
 class AppDistributionProvider;
 class AutocompleteProvider;
+class BrandedImageProvider;
 class GURL;
 class InfoBarViewDelegate;
 class OmahaServiceProvider;
@@ -175,6 +176,9 @@ class ChromeBrowserProvider {
   virtual std::unique_ptr<sync_sessions::SyncedWindowDelegatesGetter>
   CreateSyncedWindowDelegatesGetter(ios::ChromeBrowserState* browser_state);
 
+  // Returns an instance of the branded image provider.
+  virtual BrandedImageProvider* GetBrandedImageProvider() const;
+
   // Returns the NativeAppWhitelistManager implementation.
   virtual id<NativeAppWhitelistManager> GetNativeAppWhitelistManager() const;