memory coordinator: Add MemoryCoordinatorClient::OnPurgeMemory()

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 1dcaaa6f25a0819ac9b32f3e6748c033b2c1c9cf..d08cc389d906d5fccb315598f0abd96fe44476ba 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -1668,8 +1668,7 @@ void RenderThreadImpl::OnProcessPurgeAndSuspend() {
   if (base::FeatureList::IsEnabled(features::kPurgeAndSuspend)) {
     // TODO(tasak): After enabling MemoryCoordinator, remove this Notify
     // and follow MemoryCoordinator's request.
-    base::MemoryCoordinatorClientRegistry::GetInstance()->Notify(
-        base::MemoryState::SUSPENDED);
+    base::MemoryCoordinatorClientRegistry::GetInstance()->PurgeMemory();
   }
   // Since purging is not a synchronous task (e.g. v8 GC, oilpan GC, ...),
   // we need to wait until the task is finished. So wait 15 seconds and
@@ -1840,24 +1839,6 @@ void RenderThreadImpl::RecordPurgeAndSuspendMemoryGrowthMetrics() const {
                         total_allocated_mb) * 1024);
 }
 
-void RenderThreadImpl::OnProcessResume() {
-  ChildThreadImpl::OnProcessResume();
-
-  if (!RendererIsHidden())
-    return;
-
-  // TODO(bashi): Enable the tab suspension when MemoryCoordinator is enabled.
-  if (base::FeatureList::IsEnabled(features::kMemoryCoordinator))
-    return;
-
-  if (base::FeatureList::IsEnabled(features::kPurgeAndSuspend)) {
-    // TODO(tasak): after enabling MemoryCoordinator, remove this Notify
-    // and follow MemoryCoordinator's request.
-    base::MemoryCoordinatorClientRegistry::GetInstance()->Notify(
-        base::MemoryState::NORMAL);
-  }
-}
-
 scoped_refptr<gpu::GpuChannelHost> RenderThreadImpl::EstablishGpuChannelSync() {
   TRACE_EVENT0("gpu", "RenderThreadImpl::EstablishGpuChannelSync");
 
@@ -2221,29 +2202,16 @@ void RenderThreadImpl::OnMemoryStateChange(base::MemoryState state) {
     blink::WebMemoryCoordinator::onMemoryStateChange(
         static_cast<blink::MemoryState>(state));
   }
-  switch (state) {
-    case base::MemoryState::NORMAL:
-      break;
-    case base::MemoryState::THROTTLED:
-      // TODO(bashi): Figure out what kind of strategy is suitable on
-      // THROTTLED state. crbug.com/674815
-#if defined(OS_ANDROID)
-      OnTrimMemoryImmediately();
-#else
-      OnSyncMemoryPressure(
-          base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE);
-#endif
-      ReleaseFreeMemory();
-      break;
-    case base::MemoryState::SUSPENDED:
-      OnTrimMemoryImmediately();
-      ReleaseFreeMemory();
-      ClearMemory();
-      break;
-    case base::MemoryState::UNKNOWN:
-      NOTREACHED();
-      break;
-  }
+}
+
+void RenderThreadImpl::OnPurgeMemory() {
+  OnTrimMemoryImmediately();
+  ReleaseFreeMemory();
+  ClearMemory();
+  // TODO(bashi): Add onPurgeMemory() to blink::WebMemoryCoordinator.
+  // Notifies pseudo SUSPENDED state change to purge memory in blink.
+  // crbug.com/684287
+  OnMemoryStateChange(base::MemoryState::SUSPENDED);
 }
 
 void RenderThreadImpl::ClearMemory() {