Suppress the Android keyboard when selecting VR UI input fields.

chrome/browser/android/vr_shell/vr_shell.cc

Index: chrome/browser/android/vr_shell/vr_shell.cc
diff --git a/chrome/browser/android/vr_shell/vr_shell.cc b/chrome/browser/android/vr_shell/vr_shell.cc
index ab3b67ac4529a57e6708f2c6ea1ef9543128f90a..53c7b49f986437bfa2e494c4d3335582dee9dc13 100644
--- a/chrome/browser/android/vr_shell/vr_shell.cc
+++ b/chrome/browser/android/vr_shell/vr_shell.cc
@@ -63,6 +63,20 @@ void SetIsInVR(content::WebContents* contents, bool is_in_vr) {
 
 }  // namespace
 
+class UiWebContentsObserver : public content::WebContentsObserver {

[cjgrant, 2017/03/07 20:34:47]

This class could live in a separate file, but given its size, I started it here.
 Happy to move it out if you guys prefer.

[mthiesse, 2017/03/07 20:49:24]

VrShell is already an observer of the UI web contents. Please either re-use
that, or merge that one into this one.

[cjgrant, 2017/03/07 21:08:46]

Done.  Wow, need to check eyes. 

+ public:
+  explicit UiWebContentsObserver(content::WebContents* web_contents)
+      : WebContentsObserver(web_contents) {}
+
+ private:
+  void RenderViewHostChanged(content::RenderViewHost* old_host,
+                             content::RenderViewHost* new_host) override {
+    new_host->GetWidget()->GetView()->SetIsInVR(true);
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(UiWebContentsObserver);
+};
+
 VrShell::VrShell(JNIEnv* env,
                  jobject obj,
                  ui::WindowAndroid* content_window,
@@ -138,6 +152,8 @@ void VrShell::SwapContents(
   content_input_manager_ = base::MakeUnique<VrInputManager>(main_contents_);
   vr_web_contents_observer_ = base::MakeUnique<VrWebContentsObserver>(
       main_contents_, html_interface_.get(), this);
+  ui_web_contents_observer_ =
+      base::MakeUnique<UiWebContentsObserver>(ui_contents_);
   // TODO(billorr): Make VrMetricsHelper tab-aware and able to track multiple
   // tabs. crbug.com/684661
   metrics_helper_ = base::MakeUnique<VrMetricsHelper>(main_contents_);