Add "hamburger" key accelerator

Some units have a dedicated "hamburger" key. Let's use it as an
accelerator to invoke the system tray.

BUG=b:63576567

Change-Id: Iead7b38daae9da0c4f14362e14e13e9ee9345c8c
Reviewed-on: https://chromium-review.googlesource.com/571610Reviewed-by: Dan Erat <derat@chromium.org>
Commit-Queue: Dmitry Torokhov <dtor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486958}

ash/accelerators/accelerator_table.cc

@@ -132,6 +132,9 @@ const AcceleratorData kAcceleratorData[] = {
     {true, ui::VKEY_P, ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN, SHOW_STYLUS_TOOLS},
     {true, ui::VKEY_S, ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN,
      SHOW_SYSTEM_TRAY_BUBBLE},
+    // Until we have unified settings and notifications the "hamburger"
+    // key opens quick settings.
+    {true, ui::VKEY_SETTINGS, ui::EF_NONE, SHOW_SYSTEM_TRAY_BUBBLE},
     {true, ui::VKEY_K, ui::EF_SHIFT_DOWN | ui::EF_COMMAND_DOWN,
      SHOW_IME_MENU_BUBBLE},
     {true, ui::VKEY_1, ui::EF_ALT_DOWN, LAUNCH_APP_0},

ash/accelerators/accelerator_table_unittest.cc

@@ -15,12 +15,12 @@ namespace ash {
 
 namespace {
 
-// The number of non-Search-based accelerators as of 2017-07-08.
-constexpr int kNonSearchAcceleratorsNum = 93;
-// The hash of non-Search-based accelerators as of 2017-07-08.
+// The number of non-Search-based accelerators as of 2017-07-13.
+constexpr int kNonSearchAcceleratorsNum = 94;
+// The hash of non-Search-based accelerators as of 2017-07-13.
 // See HashAcceleratorData().
 constexpr char kNonSearchAcceleratorsHash[] =
-    "b585642b182679454e0e924dffc92463";
+    "c3eb838b5d191e508954efb75bf73cb3";
 
 struct Cmp {
   bool operator()(const AcceleratorData& lhs, const AcceleratorData& rhs) {