cc: Partial tile update for one-copy raster.

content/browser/gpu/compositor_util.h

Index: content/browser/gpu/compositor_util.h
diff --git a/content/browser/gpu/compositor_util.h b/content/browser/gpu/compositor_util.h
index 3400fba28474e6aa2856e8a93e4ec999a2199ac1..df1b55eaf911f60f4888d0ff2140f12b2e132c40 100644
--- a/content/browser/gpu/compositor_util.h
+++ b/content/browser/gpu/compositor_util.h
@@ -32,6 +32,10 @@ CONTENT_EXPORT bool IsImplSidePaintingEnabled();
 // Only one of one-copy and zero-copy can be enabled at a time.
 CONTENT_EXPORT bool IsOneCopyUploadEnabled();
 
+// Returns true if the GpuMemoryBuffer implementation used by the compositor
+// supports persistent contents across maps.
+CONTENT_EXPORT bool HavePersistentGpuMemoryBuffers();

[reveman, 2015/05/22 17:15:13]

I'm not sure the name of this function makes sense. We can always support it as
we have a shmem fallback. --enable-native-gpu-memory-buffers doesn't mean that
that native type is the only implementation used. It means that we'll use it if
supported by the format and usage requested.

I think IsPersistentMapGpuMemoryBufferUsageEnabled() would be more appropriate
as the implementation of this function answers the question of whether we should
use persistent map or not.

[danakj, 2015/05/26 19:02:52]

okay~

[danakj, 2015/05/26 23:37:34]

Done.

+
 // Returns true if zero-copy uploads is on (via flags, or platform default).
 // Only one of one-copy and zero-copy can be enabled at a time.
 CONTENT_EXPORT bool IsZeroCopyUploadEnabled();