Add chrome side webusb permission UI code

chrome/browser/usb/usb_chooser_choices.cc

Index: chrome/browser/usb/usb_chooser_choices.cc
diff --git a/chrome/browser/usb/usb_chooser_choices.cc b/chrome/browser/usb/usb_chooser_choices.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c20c5edabe2dc448bbfaaf0b6b2a6e408aa62c6f
--- /dev/null
+++ b/chrome/browser/usb/usb_chooser_choices.cc
@@ -0,0 +1,126 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/usb/usb_chooser_choices.h"
+
+#include "base/bind.h"
+#include "base/stl_util.h"
+#include "base/strings/utf_string_conversions.h"
+#include "content/public/browser/render_frame_host.h"
+#include "device/core/device_client.h"
+#include "device/devices_app/usb/type_converters.h"
+#include "device/usb/usb_device.h"
+#include "device/usb/usb_device_filter.h"
+#include "device/usb/usb_service.h"
+
+namespace {
+
+// Check if the origin is in the description set.
+bool FindOriginInDescriptorSet(const device::WebUsbDescriptorSet* set,
+                               const GURL& origin) {
+  if (!set)
+    return false;
+
+  if (ContainsValue(set->origins, origin)) {
+    return true;
+  }
+
+  for (const auto& config : set->configurations) {
+    if (ContainsValue(config.origins, origin)) {
+      return true;
+    }
+
+    for (const auto& function : config.functions) {
+      if (ContainsValue(function.origins, origin)) {
+        return true;
+      }
+    }
+  }
+
+  return false;
+}
+
+}  // namespace
+
+UsbChooserChoices::UsbChooserChoices(
+    mojo::Array<device::usb::DeviceFilterPtr> device_filters,
+    content::RenderFrameHost* render_frame_host,
+    const webusb::WebUsbPermissionBubble::GetPermissionCallback& callback)
+    : device_filters_(device_filters.Pass()),
+      render_frame_host_(render_frame_host),
+      callback_(callback),
+      usb_service_observer_(this) {
+  device::UsbService* usb_service =
+      device::DeviceClient::Get()->GetUsbService();
+  if (!usb_service)
+    return;
+
+  usb_service_observer_.Add(usb_service);
+
+  if (!device_filters_.is_null())
+    filters_ = device_filters_.To<std::vector<device::UsbDeviceFilter>>();
+  origin_ = render_frame_host_->GetLastCommittedURL().GetOrigin();
+
+  usb_service->GetDevices(base::Bind(&UsbChooserChoices::GetUsbDevicesList,
+                                     base::Unretained(this)));
+}
+
+UsbChooserChoices::~UsbChooserChoices() {
+  if (!callback_.is_null()) {

[Reilly Grant (use Gerrit), 2015/10/29 01:11:33]

nit: No braces for single line ifs.

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

Done.

+    callback_.Run(nullptr);
+  }
+}
+
+const std::vector<std::string>& UsbChooserChoices::GetChoices() const {
+  return devices_names_;
+}
+
+// index < 0 means cancel button was pressed.
+void UsbChooserChoices::Select(int index) {
+  if (index >= 0 && index < static_cast<int>(devices_.size())) {
+    device::usb::DeviceInfoPtr device_info_ptr =
+        device::usb::DeviceInfo::From(*devices_[index]);
+    callback_.Run(device_info_ptr.Pass());
+  } else {
+    callback_.Run(nullptr);
+  }
+  callback_.reset();  // reset callback so that it is only called once.

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

nit: "Reset |callback| so that it is only run once."

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

Done.

+}
+
+void UsbChooserChoices::OnDeviceAdded(scoped_refptr<device::UsbDevice> device) {
+  auto itor = std::find(devices_.begin(), devices_.end(), device);
+  if (itor == devices_.end() &&

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

There will never be an OnDeviceAdded call for a device that has already been
added. If you wish you can DCHECK(!ContainsValue(devices_, device));

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

Done.

+      device::UsbDeviceFilter::MatchesAny(device, filters_) &&
+      FindOriginInDescriptorSet(device->webusb_allowed_origins(), origin_)) {
+    devices_.push_back(device);
+    devices_names_.push_back(base::UTF16ToASCII(device->product_string()));
+    recently_updated_index_ = static_cast<int>(devices_names_.size()) - 1;
+    observer()->OnChoicesChanged();
+  }
+}
+
+void UsbChooserChoices::OnDeviceRemoved(
+    scoped_refptr<device::UsbDevice> device) {
+  auto itor = std::find(devices_.begin(), devices_.end(), device);
+  if (itor != devices_.end()) {
+    recently_updated_index_ = itor - devices_.begin();
+    devices_.erase(itor);
+    devices_names_.erase(devices_names_.begin() + recently_updated_index_);
+    observer()->OnChoicesChanged();
+  }
+}
+
+// Get a list of devices that can be shown in the chooser bubble UI for
+// user to grant permsssion.
+void UsbChooserChoices::GetUsbDevicesList(
+    const std::vector<scoped_refptr<device::UsbDevice>>& devices) {
+  for (const auto& device : devices) {
+    if (device::UsbDeviceFilter::MatchesAny(device, filters_) &&
+        FindOriginInDescriptorSet(device->webusb_allowed_origins(), origin_)) {
+      devices_.push_back(device);
+      devices_names_.push_back(base::UTF16ToASCII(device->product_string()));
+    }
+  }
+  observer()->OnChoicesChanged();
+}