Add chrome side webusb permission UI code

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index a9c79916295aebbe951282d1dd1d33ce3c33d9ba..c72d8a0ad87d6eca388f335aaee404278bbee161 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -272,6 +272,10 @@
 #include "chrome/browser/media/router/presentation_service_delegate_impl.h"
 #endif
 
+#if !defined(OS_ANDROID) && !defined(OS_IOS)
+#include "components/webusb/public/interfaces/webusb_permission_bubble.mojom.h"
+#endif
+
 using base::FileDescriptor;
 using blink::WebWindowFeatures;
 using content::AccessTokenStore;
@@ -647,6 +651,23 @@ void CreateUsbDeviceManager(
 #endif  // !defined(OS_ANDROID) && !defined(OS_IOS)
 }
 
+#if !defined(OS_ANDROID) && !defined(OS_IOS)
+void CreateWebUsbPermissionBubble(
+    RenderFrameHost* render_frame_host,
+    mojo::InterfaceRequest<webusb::WebUsbPermissionBubble> request) {
+  WebContents* web_contents =
+      WebContents::FromRenderFrameHost(render_frame_host);
+  if (!web_contents) {
+    NOTREACHED();
+    return;
+  }
+
+  UsbTabHelper* tab_helper =
+      UsbTabHelper::GetOrCreateForWebContents(web_contents);
+  tab_helper->CreatePermissionBubble(render_frame_host, request.Pass());
+}
+#endif
+
 }  // namespace
 
 ChromeContentBrowserClient::ChromeContentBrowserClient()
@@ -2586,6 +2607,10 @@ void ChromeContentBrowserClient::RegisterRenderFrameMojoServices(
     content::ServiceRegistry* registry,
     content::RenderFrameHost* render_frame_host) {
   registry->AddService(base::Bind(&CreateUsbDeviceManager, render_frame_host));
+#if !defined(OS_ANDROID) && !defined(OS_IOS)

[Reilly Grant (use Gerrit), 2015/10/29 01:11:32]

It is possible, like for DeviceManager, to avoid these #ifdefs except in the
Create() function.

[juncai, 2015/10/31 04:15:36]

Tried moving webusb.gypi to be included in all platforms in components.gyp, then
ios trybot got "gyp: Cycles in .gyp file dependency graph detected" error.

+  registry->AddService(
+      base::Bind(&CreateWebUsbPermissionBubble, render_frame_host));
+#endif
 }
 
 void ChromeContentBrowserClient::OpenURL(