Add shortcut keys to ui scaling

ash/accelerators/accelerator_table.cc

Index: ash/accelerators/accelerator_table.cc
diff --git a/ash/accelerators/accelerator_table.cc b/ash/accelerators/accelerator_table.cc
index 54e4c5b5dee9f2a5bcd127336026e590ad426348..fa50f037203ee16c541cf9d11b0f3954f0c13386 100644
--- a/ash/accelerators/accelerator_table.cc
+++ b/ash/accelerators/accelerator_table.cc
@@ -77,7 +77,12 @@ const AcceleratorData kAcceleratorData[] = {
   // Extra shortcut to lock the screen on linux desktop.
   { true, ui::VKEY_POWER, ui::EF_SHIFT_DOWN, LOCK_PRESSED },
   { false, ui::VKEY_POWER, ui::EF_SHIFT_DOWN, LOCK_RELEASED },
+  // Extra shortcut to rotate/scale up/down the screen on linux desktop.
   { true, ui::VKEY_F3, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN, ROTATE_SCREEN },
+  { true, ui::VKEY_F2,
+    ui::EF_CONTROL_DOWN , SCALE_UI_DOWN },
+  { true, ui::VKEY_F2,
+    ui::EF_CONTROL_DOWN | ui::EF_SHIFT_DOWN, SCALE_UI_UP },
 #endif  // !defined(NDEBUG)
   { true, ui::VKEY_O, ui::EF_CONTROL_DOWN, OPEN_FILE_DIALOG },
   { true, ui::VKEY_M, ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN,
@@ -101,6 +106,10 @@ const AcceleratorData kAcceleratorData[] = {
     NEW_INCOGNITO_WINDOW },
   { true, ui::VKEY_N, ui::EF_CONTROL_DOWN, NEW_WINDOW },
   { true, ui::VKEY_T, ui::EF_CONTROL_DOWN, NEW_TAB },
+  { true, ui::VKEY_BROWSER_BACK,
+    ui::EF_CONTROL_DOWN | ui::EF_SHIFT_DOWN, SCALE_UI_DOWN },
+  { true, ui::VKEY_BROWSER_FORWARD,
+    ui::EF_CONTROL_DOWN | ui::EF_SHIFT_DOWN, SCALE_UI_UP },
   { true, ui::VKEY_BROWSER_REFRESH,
     ui::EF_CONTROL_DOWN | ui::EF_SHIFT_DOWN, ROTATE_SCREEN },
   { true, ui::VKEY_BROWSER_REFRESH,
@@ -129,7 +138,8 @@ const AcceleratorData kAcceleratorData[] = {
   { true, ui::VKEY_F14, ui::EF_NONE, SHOW_KEYBOARD_OVERLAY },
   { true, ui::VKEY_N, ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN,
     SHOW_MESSAGE_CENTER_BUBBLE },
-  { true, ui::VKEY_BROWSER_BACK, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN,
+  { true, ui::VKEY_BROWSER_BACK,
+    ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN,
     SHOW_OAK },
   { true, ui::VKEY_S, ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN,
     SHOW_SYSTEM_TRAY_BUBBLE },