diff --git a/sharing/internal/api/mock_sharing_platform.h b/sharing/internal/api/mock_sharing_platform.h
index bdcb0a36..9ee5a5f4 100644
--- a/sharing/internal/api/mock_sharing_platform.h
+++ b/sharing/internal/api/mock_sharing_platform.h
@@ -49,6 +49,9 @@ class MockSharingPlatform : public SharingPlatform {
   MockSharingPlatform& operator=(const MockSharingPlatform&) = delete;
   ~MockSharingPlatform() override = default;
 
+  MOCK_METHOD(void, InitProductIdGetter,
+              (absl::string_view (*product_id_getter)()), (override));
+
   MOCK_METHOD(void, InitLogging, (absl::string_view log_file_base_name),
               (override));
 
diff --git a/sharing/internal/api/sharing_platform.h b/sharing/internal/api/sharing_platform.h
index 04c6a383..934b72b4 100644
--- a/sharing/internal/api/sharing_platform.h
+++ b/sharing/internal/api/sharing_platform.h
@@ -47,6 +47,10 @@ class SharingPlatform {
  public:
   virtual ~SharingPlatform() = default;
 
+  // Provide a function ptr that is used to retrieve the Omaha product ID.
+  virtual void InitProductIdGetter(
+      absl::string_view (*product_id_getter)()) = 0;
+
   // This function should only be called once.
   virtual void InitLogging(absl::string_view log_file_base_name) = 0;