Add PERSISTENT_MAP usage for GpuMemoryBuffers.

content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.cc

Index: content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.cc
diff --git a/content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.cc b/content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.cc
index 02a5048d27f1a530c65df9b3a315ac22afda21f3..55fc101a05be5abfc7a75727b34fc94c668f33e3 100644
--- a/content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.cc
+++ b/content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.cc
@@ -120,6 +120,17 @@ bool GpuMemoryBufferImplSharedMemory::IsFormatSupported(Format format) {
 }
 
 // static
+bool GpuMemoryBufferImplSharedMemory::IsUsageSupported(Usage usage) {
+  switch (usage) {
+    case MAP:
+    case PERSISTENT_MAP:
+      return true;
+    case SCANOUT:
+      return false;
+  }
+}

[reveman, 2015/05/20 14:26:08]

NOTREACHED();
return false;

[danakj, 2015/05/20 17:51:14]

Done.

+
+// static
 bool GpuMemoryBufferImplSharedMemory::IsSizeValidForFormat(
     const gfx::Size& size,
     Format format) {