Add context to gfx::Screen calls in support of simultaneous desktop+ash

chrome/app/chrome_dll.rc

 // Microsoft Visual C++ generated resource script.
 //
 #include "chrome_dll_resource.h"
 #include "chrome_command_ids.h"
 
 #define APSTUDIO_READONLY_SYMBOLS
 /////////////////////////////////////////////////////////////////////////////
 //
 // Generated from the TEXTINCLUDE 2 resource.
 //
@@ skipping 104 matching lines @@
     VK_OEM_PERIOD,  IDC_TOGGLE_SPEECH_INPUT,    VIRTKEY, CONTROL, SHIFT
     "U",            IDC_VIEW_SOURCE,            VIRTKEY, CONTROL
     VK_OEM_MINUS,   IDC_ZOOM_MINUS,             VIRTKEY, CONTROL
     VK_OEM_MINUS,   IDC_ZOOM_MINUS,             VIRTKEY, CONTROL, SHIFT
     VK_SUBTRACT,    IDC_ZOOM_MINUS,             VIRTKEY, CONTROL
     "0",            IDC_ZOOM_NORMAL,            VIRTKEY, CONTROL
     VK_NUMPAD0,     IDC_ZOOM_NORMAL,            VIRTKEY, CONTROL
     VK_OEM_PLUS,    IDC_ZOOM_PLUS,              VIRTKEY, CONTROL
     VK_OEM_PLUS,    IDC_ZOOM_PLUS,              VIRTKEY, CONTROL, SHIFT
     VK_ADD,         IDC_ZOOM_PLUS,              VIRTKEY, CONTROL
+    "A",            IDC_TOGGLE_ASH_DESKTOP,     VIRTKEY, CONTROL, SHIFT
 END
 
 IDR_CHROMEFRAME ACCELERATORS
 BEGIN
     "I",            IDC_DEV_TOOLS,              VIRTKEY, CONTROL, SHIFT
     "J",            IDC_DEV_TOOLS_CONSOLE,      VIRTKEY, CONTROL, SHIFT
     "C",            IDC_DEV_TOOLS_INSPECT,      VIRTKEY, CONTROL, SHIFT
     VK_OEM_MINUS,   IDC_ZOOM_MINUS,             VIRTKEY, CONTROL
     VK_OEM_MINUS,   IDC_ZOOM_MINUS,             VIRTKEY, CONTROL, SHIFT
     VK_SUBTRACT,    IDC_ZOOM_MINUS,             VIRTKEY, CONTROL
@@ skipping 120 matching lines @@
 //
 // Generated from the TEXTINCLUDE 3 resource.
 //
 
 
 /////////////////////////////////////////////////////////////////////////////
 #endif    // not APSTUDIO_INVOKED
 
 // (temp change to touch this file or incremental builds may break now
 // that we removed chrome_dll_version.rc from it)