Move purging from OnMemoryState to OnPurgeMemory() in cc/

cc/resources/resource_pool.cc

Index: cc/resources/resource_pool.cc
diff --git a/cc/resources/resource_pool.cc b/cc/resources/resource_pool.cc
index 61a7ae3f9fdc6519376a1b473631a73bc7cd3d40..54e33c5f5bbdab328b6e3f9606ca23ed12c2e0ef 100644
--- a/cc/resources/resource_pool.cc
+++ b/cc/resources/resource_pool.cc
@@ -481,22 +481,17 @@ bool ResourcePool::OnMemoryDump(const base::trace_event::MemoryDumpArgs& args,
 }
 
 void ResourcePool::OnMemoryStateChange(base::MemoryState state) {
-  switch (state) {
-    case base::MemoryState::NORMAL:
-      // TODO(tasak): go back to normal state.
-      break;
-    case base::MemoryState::THROTTLED:
-      // TODO(tasak): make the limits of this component's caches smaller to
-      // save memory usage.
-      break;
-    case base::MemoryState::SUSPENDED:
-      // Release all resources, regardless of how recently they were used.
-      EvictResourcesNotUsedSince(base::TimeTicks() + base::TimeDelta::Max());
-      break;
-    case base::MemoryState::UNKNOWN:
-      // NOT_REACHED.
-      break;
-  }
+  // TODO(bashi): We are going to separate purging from state changes and we
+  // shouldn't purge memory here (crbug.com/684287). Tentatively call
+  // OnPurgeMemory() so that we don't break existing experiments.
+  // (i.e. purge+suspend experiment)
+  if (state == base::MemoryState::SUSPENDED)
+    OnPurgeMemory();
+}
+
+void ResourcePool::OnPurgeMemory() {
+  // Release all resources, regardless of how recently they were used.
+  EvictResourcesNotUsedSince(base::TimeTicks() + base::TimeDelta::Max());
 }
 
 }  // namespace cc