Increase software compositor memory limit to 128MB

This limit is a bit arbitrary and may be getting hit by Google Docs, so double it.

BUG=372909

Review URL: https://codereview.chromium.org/288343007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271988 0039d316-1c4b-4281-b951-d872f2087c98

content/renderer/gpu/compositor_output_surface.cc

@@ -105,7 +105,7 @@ bool CompositorOutputSurface::BindToClient(
   if (!context_provider()) {
     // Without a GPU context, the memory policy otherwise wouldn't be set.
     client->SetMemoryPolicy(cc::ManagedMemoryPolicy(
-        64 * 1024 * 1024,
+        128 * 1024 * 1024,
         gpu::MemoryAllocation::CUTOFF_ALLOW_NICE_TO_HAVE,
         cc::ManagedMemoryPolicy::kDefaultNumResourcesLimit));
   }