Switch Voice Interaction shortcut to VKEY_ASSISTANT

Now that we have dedicated key for the assistant, let's start using it,
in addition to Meta-A.

BUG=b:36735408

Change-Id: Ide16328acd1725b36e82016eba14a320c83acd3a
Reviewed-on: https://chromium-review.googlesource.com/550414
Commit-Queue: Dmitry Torokhov <dtor@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485149}

ash/accelerators/accelerator_table.cc

@@ -161,6 +161,7 @@ const AcceleratorData kAcceleratorData[] = {
 
     // Voice Interaction shortcuts.
     {true, ui::VKEY_A, ui::EF_COMMAND_DOWN, START_VOICE_INTERACTION},
+    {true, ui::VKEY_ASSISTANT, ui::EF_NONE, START_VOICE_INTERACTION},
     // Temporary shortcut added for UX/PM exploration.
     // TODO(updowndota): Remove the temporary shortcut.
     {true, ui::VKEY_SPACE, ui::EF_COMMAND_DOWN, START_VOICE_INTERACTION},

ash/accelerators/accelerator_table_unittest.cc

@@ -15,12 +15,12 @@ namespace ash {
 
 namespace {
 
-// The number of non-Search-based accelerators as of 2017-06-26.
-constexpr int kNonSearchAcceleratorsNum = 92;
-// The hash of non-Search-based accelerators as of 2017-06-26.
+// 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.
 // See HashAcceleratorData().
 constexpr char kNonSearchAcceleratorsHash[] =
-    "c45246c981cba1fe2c6d0d3c494e1117";
+    "b585642b182679454e0e924dffc92463";
 
 struct Cmp {
   bool operator()(const AcceleratorData& lhs, const AcceleratorData& rhs) {