cros: Allow pin keyboard to keep focus without popping up the pin keyboard.

ui/keyboard/keyboard_util.h

Index: ui/keyboard/keyboard_util.h
diff --git a/ui/keyboard/keyboard_util.h b/ui/keyboard/keyboard_util.h
index 2eefc9b02d69e4962ba86066fde314e0dd67675a..ef0ae61a4ebca7719b65add8fd1286c58545dbf2 100644
--- a/ui/keyboard/keyboard_util.h
+++ b/ui/keyboard/keyboard_util.h
@@ -65,6 +65,14 @@ enum KeyboardState {
 KEYBOARD_EXPORT gfx::Rect FullWidthKeyboardBoundsFromRootBounds(
     const gfx::Rect& root_bounds, int keyboard_height);
 
+// Blocks the keyboard from showing up. This should only be used for cases where
+// the focus needs to be passed around without poping up the keyboard. It needs
+// to be turned off when done with otherwise the keyboard will not pop up again.
+KEYBOARD_EXPORT void SetForceDisableVirtualKeyboardForWebUi(bool disable);

[xiyuan, 2016/11/09 18:06:32]

Why do we need to call out "webui" in the API? Can it be used for other
purposes?

Also, do we want to make a ScopedVirtualKeyboardDisabler helper class to ensure
the VK is re-enabled after caller is done with it?

[sammiequon, 2016/11/10 21:06:01]

I added the webui becuase this function is used exclusively for the lock screen
webui at the moment and hopefully will be replaced by a better solution in the
future. If something else uses this we can drop the webui; what do you think?
Added scoped helper class.

[xiyuan, 2016/11/10 21:48:35]

As an API, it should be generic. I would say drop "webui" unless this should
only be called for an webui. And I don't think we have this case here.

Also, it seems that we can use

keyboard::SetRequestedKeyboardState(keyboard::KEYBOARD_STATE_DISABLED)

to achieve similar goal and maybe not even need a new API.

What do you think?

[sammiequon, 2016/11/10 22:36:56]

Dropped. Using SetRequestedKeyboardState would only work for the normal keyboard
and not the accessibility keyboard since accessibility keyboard takes charge
over all other things, except this newly added one.

[xiyuan, 2016/11/10 22:40:58]

Acknowledged.

+
+// Return true if keyboard has been blocked from showing up for web ui purposes.
+KEYBOARD_EXPORT bool GetForceDisableVirtualKeyboardForWebUi();
+
 // Sets the state of the a11y onscreen keyboard.
 KEYBOARD_EXPORT void SetAccessibilityKeyboardEnabled(bool enabled);