[Memory-UMA] Implement basic working prototype.

services/resource_coordinator/memory/coordinator/coordinator_impl_unittest.cc

Index: services/resource_coordinator/memory/coordinator/coordinator_impl_unittest.cc
diff --git a/services/resource_coordinator/memory/coordinator/coordinator_impl_unittest.cc b/services/resource_coordinator/memory/coordinator/coordinator_impl_unittest.cc
index f743a2b273d0224e5c1b3651fed229ce9f8909e1..a3069a3c3b223556e3f82bb31378b207d01d1807 100644
--- a/services/resource_coordinator/memory/coordinator/coordinator_impl_unittest.cc
+++ b/services/resource_coordinator/memory/coordinator/coordinator_impl_unittest.cc
@@ -17,12 +17,21 @@
 
 namespace memory_instrumentation {
 
+class CoordinatorImplFake : public CoordinatorImpl {
+ public:
+  CoordinatorImplFake() : CoordinatorImpl(false, nullptr) {}
+  ~CoordinatorImplFake() override {}
+  service_manager::Identity GetDispatchContext() const override {
+    return service_manager::Identity();
+  }
+};
+
 class CoordinatorImplTest : public testing::Test {
  public:
   CoordinatorImplTest() {}
   void SetUp() override {
     dump_response_args_ = {0U, false};
-    coordinator_.reset(new CoordinatorImpl(false));
+    coordinator_.reset(new CoordinatorImplFake);
   }
 
   void TearDown() override { coordinator_.reset(); }