Add a flag to disable partial raster in renderer

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 ea82ca1c47ec5b5e7d9908330d726bd035f36c4b..82cd77868a4d7e4cfc0c42619106da38d056de8a 100644
--- a/content/browser/gpu/compositor_util.h
+++ b/content/browser/gpu/compositor_util.h
@@ -21,9 +21,8 @@ CONTENT_EXPORT bool IsPropertyTreeVerificationEnabled();
 // Only one of one-copy and zero-copy can be enabled at a time.
 CONTENT_EXPORT bool IsZeroCopyUploadEnabled();
 
-// Returns true if a persistent GpuMemoryBuffer can be used and is on (via
-// flags, or platform default).
-CONTENT_EXPORT bool IsPersistentGpuMemoryBufferEnabled();
+// Returns true if a partial raster is on (via flags).
+CONTENT_EXPORT bool IsPartialRasterEnabled();
 
 // Returns true if gpu rasterization is on (via flags) for the renderer.
 CONTENT_EXPORT bool IsGpuRasterizationEnabled();