Generates correct key code for space key in the system fallback vk.

Bug: 842548
Change-Id: I42a81f539d57ec244f2583bbc8bda9126b11256e
Reviewed-on: https://chromium-review.googlesource.com/c/1351197
Commit-Queue: Shu Chen <shuchen@chromium.org>
Reviewed-by: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611199}

chrome/test/data/chromeos/virtual_keyboard/default_extension/typing_test.js

@@ -16,7 +16,7 @@ function testLowercaseKeysetAsync(testDoneCallback) {
     mockTypeCharacter('s', 0x53, Modifier.NONE);
     mockTypeCharacter('.', 0, Modifier.NONE);
     mockTypeCharacter('Enter', 0x0D, Modifier.NONE, 0x0D);
-    mockTypeCharacter('Space', 0, Modifier.NONE, 0x20);
+    mockTypeCharacter('Space', 0x20, Modifier.NONE, 0x20);
     testDoneCallback();
   });
 }

ui/keyboard/resources/inputview_adapter.js

@@ -180,6 +180,7 @@ function registerInputviewApi() {
     Quote: 0xBF,
     Semicolon: 0xBA,
     Slash: 0xBF,
+    Space: 0x20,
     Tab: 0x09
   };