Add delegate and factory function for ChildMemoryCoordinator

components/memory_coordinator/child/child_memory_coordinator_impl_unittest.cc

Index: components/memory_coordinator/child/child_memory_coordinator_impl_unittest.cc
diff --git a/components/memory_coordinator/child/child_memory_coordinator_impl_unittest.cc b/components/memory_coordinator/child/child_memory_coordinator_impl_unittest.cc
index 445aeb0877b3be5b2346a6fd99bf729f77520679..d01bd02c74e1821fbc2a2b6c89deb5f570ccf23b 100644
--- a/components/memory_coordinator/child/child_memory_coordinator_impl_unittest.cc
+++ b/components/memory_coordinator/child/child_memory_coordinator_impl_unittest.cc
@@ -4,6 +4,10 @@
 
 #include "components/memory_coordinator/child/child_memory_coordinator_impl.h"
 
+#if defined(OS_ANDROID)
+#include "components/memory_coordinator/child/child_memory_coordinator_impl_android.h"
+#endif  // defined(OS_ANDROID)
+
 #include <memory>
 
 #include "base/message_loop/message_loop.h"
@@ -33,12 +37,13 @@ class MockMemoryCoordinatorHandle : public mojom::MemoryCoordinatorHandle {
   mojom::ChildMemoryCoordinatorPtr child_ = nullptr;
 };
 
-class ChildMemoryCoordinatorImplTest : public testing::Test {
+class ChildMemoryCoordinatorImplTest : public testing::Test,
+                                       public ChildMemoryCoordinatorDelegate {
  public:
   ChildMemoryCoordinatorImplTest()
       : message_loop_(new base::MessageLoop) {
     auto parent = coordinator_handle_.Bind();
-    coordinator_impl_.reset(new ChildMemoryCoordinatorImpl(std::move(parent)));
+    coordinator_impl_ = CreateChildMemoryCoordinator(std::move(parent), this);
     // Needs to run loop to initalize mojo pointers including |child_| in
     // MockMemoryCoordinatorHandle.
     base::RunLoop loop;
@@ -67,6 +72,14 @@ class ChildMemoryCoordinatorImplTest : public testing::Test {
     loop.RunUntilIdle();
   }
 
+  // ChildMemoryCoordinatorDelegate implementation:
+  void OnTrimMemoryImmediately() override {
+    on_trim_memory_called_ = true;
+  }
+
+ protected:
+  bool on_trim_memory_called_ = false;
+
  private:
   std::unique_ptr<base::MessageLoop> message_loop_;
   MockMemoryCoordinatorHandle coordinator_handle_;
@@ -159,6 +172,18 @@ TEST_F(ChildMemoryCoordinatorImplTest, MultipleClients) {
   t2.Stop();
 }
 
+#if defined(OS_ANDROID)
+TEST_F(ChildMemoryCoordinatorImplTest, OnTrimMemoryImmediately) {
+  // TRIM_MEMORY_COMPLETE defined in ComponentCallbacks2.
+  static const int kTrimMemoryComplete = 80;
+
+  ChildMemoryCoordinatorImplAndroid& coordinator_android =
+      static_cast<ChildMemoryCoordinatorImplAndroid&>(coordinator_impl());
+  coordinator_android.OnTrimMemory(kTrimMemoryComplete);
+  EXPECT_EQ(true, on_trim_memory_called_);
+}
+#endif  // defined(OS_ANDROID)
+
 }  // namespace
 
 }  // namespace memory_coordinator