Aggressively discard tiles on OS X to see if it improves

content/common/gpu/gpu_memory_manager.cc

Index: content/common/gpu/gpu_memory_manager.cc
diff --git a/content/common/gpu/gpu_memory_manager.cc b/content/common/gpu/gpu_memory_manager.cc
index 879e747be73c3e0606d5304d949acc8da1e0e407..6a8ea604c996652f6f3f7e6932023926cb99fe53 100644
--- a/content/common/gpu/gpu_memory_manager.cc
+++ b/content/common/gpu/gpu_memory_manager.cc
@@ -474,6 +474,13 @@ void GpuMemoryManager::Manage() {
       allocation.renderer_allocation.priority_cutoff_when_visible =
           GpuMemoryAllocationForRenderer::kPriorityCutoffAllowEverything;
 
+      // Expermient to determine if aggressively discarding tiles on OS X

[vangelis, 2012/12/08 01:07:02]

typo: experiment

nit: Ideally you'll want to merge this with the one above:

#if defined(OS_MACOSX)
  allocation = nicetohave
#else
  allocation = alloweverything
#endif

+      // results in greater stability.
+#if defined(OS_MACOSX)
+      allocation.renderer_allocation.priority_cutoff_when_visible =
+          GpuMemoryAllocationForRenderer::kPriorityCutoffAllowNiceToHave;
+#endif
+
       // Set the state when backgrounded.
       bool allow_allocation_when_backgrounded = false;
       if (client_state->visible) {