diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index 6a161f0f36c6..349bc78976ad 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -48,6 +48,7 @@
 #include "ui/gfx/geometry/dip_util.h"
 #include "ui/gfx/mac/coordinate_conversion.h"
 #include "ui/gl/gl_switches.h"
+#include "ui/gl/gpu_switching_manager.h"
 
 using blink::WebInputEvent;
 using blink::WebMouseEvent;
@@ -1112,6 +1113,12 @@ void RenderWidgetHostViewMac::SetBackgroundColor(SkColor color) {
   DCHECK(SkColorGetA(color) == SK_AlphaOPAQUE ||
          SkColorGetA(color) == SK_AlphaTRANSPARENT);
   bool opaque = SkColorGetA(color) == SK_AlphaOPAQUE;
+  if (opaque) {
+    bool wantsTransparent = ui::GpuSwitchingManager::UseTransparent() ||
+                            ([cocoa_view() window] && ![[cocoa_view() window] isOpaque]);
+    if (wantsTransparent)
+      opaque = NO;
+  }
   if (background_is_opaque_ != opaque) {
     background_is_opaque_ = opaque;
     if (host())
diff --git a/content/browser/renderer_host/render_widget_host_view_cocoa.mm b/content/browser/renderer_host/render_widget_host_view_cocoa.mm
index c7ad6fa8c75f..bdfabc1061bb 100644
--- a/content/browser/renderer_host/render_widget_host_view_cocoa.mm
+++ b/content/browser/renderer_host/render_widget_host_view_cocoa.mm
@@ -178,6 +178,11 @@ void ExtractUnderlines(NSAttributedString* string,
 
 }  // namespace
 
+@interface NSWindow (AtomCustomMethods)
+- (BOOL)acceptsFirstMouse;
+- (BOOL)disableAutoHideCursor;
+@end
+
 // These are not documented, so use only after checking -respondsToSelector:.
 @interface NSApplication (UndocumentedSpeechMethods)
 - (void)speakString:(NSString*)string;
@@ -355,6 +360,9 @@ void ExtractUnderlines(NSAttributedString* string,
 }
 
 - (BOOL)acceptsFirstMouse:(NSEvent*)theEvent {
+  if ([self.window respondsToSelector:@selector(acceptsFirstMouse)] &&
+      [self.window acceptsFirstMouse])
+    return YES;
   return [self acceptsMouseEventsWhenInactive];
 }
 
@@ -555,6 +563,7 @@ void ExtractUnderlines(NSAttributedString* string,
   if (EventIsReservedBySystem(theEvent))
     return NO;
 
+#if 0
   // If we return |NO| from this function, cocoa will send the key event to
   // the menu and only if the menu does not process the event to |keyDown:|. We
   // want to send the event to a renderer _before_ sending it to the menu, so
@@ -568,6 +577,7 @@ void ExtractUnderlines(NSAttributedString* string,
     DCHECK(![[NSApp mainMenu] performKeyEquivalent:theEvent]);
     return NO;
   }
+#endif
 
   // Command key combinations are sent via performKeyEquivalent rather than
   // keyDown:. We just forward this on and if WebCore doesn't want to handle
@@ -664,6 +674,10 @@ void ExtractUnderlines(NSAttributedString* string,
                               eventType == NSKeyDown &&
                               !(modifierFlags & NSCommandKeyMask);
 
+  if ([theEvent.window respondsToSelector:@selector(disableAutoHideCursor)] &&
+      [theEvent.window disableAutoHideCursor])
+    shouldAutohideCursor = NO;
+
   // We only handle key down events and just simply forward other events.
   if (eventType != NSKeyDown) {
     client_->OnNSViewForwardKeyboardEvent(event, latency_info);
@@ -1425,9 +1439,11 @@ void ExtractUnderlines(NSAttributedString* string,
 // Since this implementation doesn't have to wait any IPC calls, this doesn't
 // make any key-typing jank. --hbono 7/23/09
 //
+#ifndef MAS_BUILD
 extern "C" {
 extern NSString* NSTextInputReplacementRangeAttributeName;
 }
+#endif
 
 - (NSArray*)validAttributesForMarkedText {
   // This code is just copied from WebKit except renaming variables.
@@ -1436,7 +1452,10 @@ extern NSString* NSTextInputReplacementRangeAttributeName;
         initWithObjects:NSUnderlineStyleAttributeName,
                         NSUnderlineColorAttributeName,
                         NSMarkedClauseSegmentAttributeName,
-                        NSTextInputReplacementRangeAttributeName, nil]);
+#ifndef MAS_BUILD
+                        NSTextInputReplacementRangeAttributeName,
+#endif
+                        nil]);
   }
   return validAttributesForMarkedText_.get();
 }