Add tests for MemoryCoordinator::Can{Throttle,Suspend}Renderer()

content/browser/memory/memory_coordinator.cc

Index: content/browser/memory/memory_coordinator.cc
diff --git a/content/browser/memory/memory_coordinator.cc b/content/browser/memory/memory_coordinator.cc
index dc9d0a9789e7b4b68650a9ba6cf815bb90ab59ac..6de5c0ca688b1d10772033751d8973d96459278d 100644
--- a/content/browser/memory/memory_coordinator.cc
+++ b/content/browser/memory/memory_coordinator.cc
@@ -73,10 +73,6 @@ void MemoryCoordinator::CreateHandle(
   CreateChildInfoMapEntry(render_process_id, std::move(handle));
 }
 
-size_t MemoryCoordinator::NumChildrenForTesting() {
-  return children_.size();
-}
-
 bool MemoryCoordinator::SetChildMemoryState(int render_process_id,
                                             mojom::MemoryState memory_state) {
   // Can't set an invalid memory state.
@@ -168,7 +164,8 @@ void MemoryCoordinator::OnConnectionError(int render_process_id) {
 }
 
 bool MemoryCoordinator::CanThrottleRenderer(int render_process_id) {
-  // If there is no delegate (i.e. tests), renderers are always throttleable.
+  // If there is no delegate (i.e. unittests), renderers are always
+  // throttleable.
   // TODO(bashi): We check |delegate_| to avoid calling FromID() on a
   // wrong thread in tests. Figure out a better way to handle tests.
   if (!delegate_)
@@ -178,7 +175,7 @@ bool MemoryCoordinator::CanThrottleRenderer(int render_process_id) {
 }
 
 bool MemoryCoordinator::CanSuspendRenderer(int render_process_id) {
-  // If there is no delegate (i.e. tests), renderers are always suspendable.
+  // If there is no delegate (i.e. unittests), renderers are always suspendable.
   if (!delegate_)
     return true;
   auto* render_process_host = RenderProcessHost::FromID(render_process_id);
@@ -187,6 +184,12 @@ bool MemoryCoordinator::CanSuspendRenderer(int render_process_id) {
   return delegate_->CanSuspendBackgroundedRenderer(render_process_id);
 }
 
+void MemoryCoordinator::SetDelegateForTesting(
+    std::unique_ptr<MemoryCoordinatorDelegate> delegate) {
+  CHECK(!delegate_);
+  delegate_ = std::move(delegate);
+}
+
 void MemoryCoordinator::CreateChildInfoMapEntry(
     int render_process_id,
     std::unique_ptr<MemoryCoordinatorHandleImpl> handle) {