Enable pinch & scrollbars by default for CrOS.

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index b7c5ffcee5b76adda9c252e205c01c1ec865461f..e7943f1524cf7b545cd0aa449f97cea9edc4c8a7 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -789,6 +789,7 @@ void RenderProcessHostImpl::PropagateBrowserCommandLineToRenderer(
     switches::kEnablePreparsedJsCaching,
     switches::kEnablePruneGpuCommandBuffers,
     switches::kEnablePinch,
+    switches::kDisablePinch,
 #if defined(OS_MACOSX)
     // Allow this to be set when invoking the browser and relayed along.
     switches::kEnableSandboxLogging,
@@ -859,6 +860,8 @@ void RenderProcessHostImpl::PropagateBrowserCommandLineToRenderer(
     cc::switches::kEnableImplSidePainting,
     cc::switches::kEnablePartialSwap,
     cc::switches::kEnablePerTilePainting,
+    cc::switches::kEnablePinchZoomScrollbars,
+    cc::switches::kDisablePinchZoomScrollbars,
     cc::switches::kEnablePredictionBenchmarking,
     cc::switches::kEnableRightAlignedScheduling,
     cc::switches::kEnableTopControlsPositionCalculation,