Add a flag to disable partial raster in renderer

chrome/browser/chromeos/login/chrome_restart_request.cc

Index: chrome/browser/chromeos/login/chrome_restart_request.cc
diff --git a/chrome/browser/chromeos/login/chrome_restart_request.cc b/chrome/browser/chromeos/login/chrome_restart_request.cc
index 9222573b9a9b961215439fd90ae160612d908ec9..e730ca5b6280ecdae344dc421facb365c1eaa5fd 100644
--- a/chrome/browser/chromeos/login/chrome_restart_request.cc
+++ b/chrome/browser/chromeos/login/chrome_restart_request.cc
@@ -83,7 +83,7 @@ void DeriveCommandLine(const GURL& start_url,
     ::switches::kDisableGpuRasterization,
     ::switches::kDisableLowResTiling,
     ::switches::kDisableMediaSource,
-    ::switches::kDisablePersistentGpuMemoryBuffer,
+    ::switches::kDisablePartialRaster,

[ericrk, 2015/10/08 00:12:20]

Is there a reason we had a disable flag as well as an enable flag? Only enable
was used. Is this just the style?

[jbroman, 2015/10/08 14:08:22]

It wasn't necessary to forward it, no.

[danakj, 2015/10/08 15:18:43]

We dont use it in compositor_util either. Delete?

[jbroman, 2015/10/08 15:19:59]

Well, the disabling flag exists because at one point this feature was on and we
needed a flag to disable it. Right now it's off by default, so the disabling
flag is a no-op. :P

[danakj, 2015/10/08 15:21:27]

Ah, that's what happened. Usually you'd only have one flag and rename it when
changing it. Or check both but have one dominate the other in the is-enabled
code. Either way there's not an unused cmd line flag hanging around. :)

[ericrk, 2015/10/13 23:03:45]

I'll remove this then.

     ::switches::kDisablePreferCompositingToLCDText,
     ::switches::kEnablePrefixedEncryptedMedia,
     ::switches::kDisablePanelFitting,
@@ -108,7 +108,7 @@ void DeriveCommandLine(const GURL& start_url,
     ::switches::kEnableImageColorProfiles,
     ::switches::kEnableLogging,
     ::switches::kEnableLowResTiling,
-    ::switches::kEnablePersistentGpuMemoryBuffer,
+    ::switches::kEnablePartialRaster,
     ::switches::kEnablePinch,
     ::switches::kEnablePreferCompositingToLCDText,
     ::switches::kEnableRGBA4444Textures,