Move device/usb classes from the FILE thread to UI thread.

device/usb/usb_device_handle_impl.h

Index: device/usb/usb_device_handle_impl.h
diff --git a/device/usb/usb_device_handle_impl.h b/device/usb/usb_device_handle_impl.h
index 688f8b9cf8db090b15be22aae83bfb32d293bb6c..0d30374e4cfe9a06ffcc3d3ea68443050a47d4ed 100644
--- a/device/usb/usb_device_handle_impl.h
+++ b/device/usb/usb_device_handle_impl.h
@@ -11,15 +11,16 @@
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
-#include "base/memory/weak_ptr.h"
-#include "base/strings/string16.h"
 #include "base/threading/thread_checker.h"
 #include "device/usb/usb_device_handle.h"
-#include "net/base/io_buffer.h"
 #include "third_party/libusb/src/libusb/libusb.h"
 
 namespace base {
-class SingleThreadTaskRunner;
+class SequencedTaskRunner;
+}
+
+namespace net {
+class IOBuffer;
 }
 
 namespace device {
@@ -37,13 +38,16 @@ class UsbDeviceHandleImpl : public UsbDeviceHandle {
  public:
   scoped_refptr<UsbDevice> GetDevice() const override;
   void Close() override;
-  bool SetConfiguration(int configuration_value) override;
-  bool ClaimInterface(int interface_number) override;
+  void SetConfiguration(int configuration_value,
+                        const UsbSuccessCallback& callback) override;
+  void ClaimInterface(int interface_number,
+                      const UsbSuccessCallback& callback) override;
   bool ReleaseInterface(int interface_number) override;
-  bool SetInterfaceAlternateSetting(int interface_number,
-                                    int alternate_setting) override;
-  bool ResetDevice() override;
-  bool GetStringDescriptor(uint8 string_id, base::string16* string) override;
+  void SetInterfaceAlternateSetting(
+      int interface_number,
+      int alternate_setting,
+      const UsbSuccessCallback& callback) override;
+  void ResetDevice(const UsbSuccessCallback& callback) override;
 
   void ControlTransfer(UsbEndpointDirection direction,
                        TransferRequestType request_type,
@@ -84,10 +88,12 @@ class UsbDeviceHandleImpl : public UsbDeviceHandle {
  protected:
   friend class UsbDeviceImpl;
 
-  // This constructor is called by UsbDevice.
-  UsbDeviceHandleImpl(scoped_refptr<UsbContext> context,
-                      scoped_refptr<UsbDeviceImpl> device,
-                      PlatformUsbDeviceHandle handle);
+  // This constructor is called by UsbDeviceImpl.
+  UsbDeviceHandleImpl(
+      scoped_refptr<UsbContext> context,
+      scoped_refptr<UsbDeviceImpl> device,
+      PlatformUsbDeviceHandle handle,
+      scoped_refptr<base::SequencedTaskRunner> blocking_task_runner);
 
   ~UsbDeviceHandleImpl() override;
 
@@ -97,6 +103,30 @@ class UsbDeviceHandleImpl : public UsbDeviceHandle {
   class InterfaceClaimer;
   class Transfer;
 
+  void SetConfigurationOnBlockingThread(PlatformUsbDeviceHandle handle,
+                                        int configuration_value,
+                                        const UsbSuccessCallback& callback);
+  void SetConfigurationComplete(bool success,
+                                const UsbSuccessCallback& callback);
+  void ClaimInterfaceOnBlockingThread(PlatformUsbDeviceHandle handle,
+                                      int interface_number,
+                                      const UsbSuccessCallback& callback);
+  void ClaimInterfaceComplete(int interface_number,
+                              bool success,
+                              const UsbSuccessCallback& callback);
+  void SetInterfaceAlternateSettingOnBlockingThread(
+      PlatformUsbDeviceHandle handle,
+      int interface_number,
+      int alternate_setting,
+      const UsbSuccessCallback& callback);
+  void SetInterfaceAlternateSettingComplete(int interface_number,
+                                            int alternate_setting,
+                                            bool success,
+                                            const UsbSuccessCallback& callback);
+  void ResetDeviceOnBlockingThread(PlatformUsbDeviceHandle handle,
+                                   const UsbSuccessCallback& callback);
+  void ResetDeviceComplete(bool success, const UsbSuccessCallback& callback);
+
   // Refresh endpoint_map_ after ClaimInterface, ReleaseInterface and
   // SetInterfaceAlternateSetting.
   void RefreshEndpointMap();
@@ -106,22 +136,14 @@ class UsbDeviceHandleImpl : public UsbDeviceHandle {
   scoped_refptr<InterfaceClaimer> GetClaimedInterfaceForEndpoint(
       unsigned char endpoint);
 
-  // If the device's task runner is on the current thread then the transfer will
-  // be submitted directly, otherwise a task to do so it posted. The callback
-  // will be called on the current message loop of the thread where this
-  // function was called.
-  void PostOrSubmitTransfer(scoped_ptr<Transfer> transfer);
-
   // Submits a transfer and starts tracking it. Retains the buffer and copies
   // the completion callback until the transfer finishes, whereupon it invokes
   // the callback then releases the buffer.
   void SubmitTransfer(scoped_ptr<Transfer> transfer);
 
-  // Invokes the callbacks associated with a given transfer, and removes it from
-  // the in-flight transfer set.
-  void CompleteTransfer(scoped_ptr<Transfer> transfer);
-
-  bool GetSupportedLanguages();
+  // Removes the transfer from the in-flight transfer set and invokes the
+  // completion callback.
+  void TransferComplete(Transfer* transfer, const base::Closure& callback);
 
   // Informs the object to drop internal references.
   void InternalClose();
@@ -130,9 +152,6 @@ class UsbDeviceHandleImpl : public UsbDeviceHandle {
 
   PlatformUsbDeviceHandle handle_;
 
-  std::vector<uint16> languages_;
-  std::map<uint8, base::string16> strings_;
-
   typedef std::map<int, scoped_refptr<InterfaceClaimer>> ClaimedInterfaceMap;
   ClaimedInterfaceMap claimed_interfaces_;
 
@@ -147,10 +166,10 @@ class UsbDeviceHandleImpl : public UsbDeviceHandle {
   // before this handle.
   scoped_refptr<UsbContext> context_;
 
-  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  scoped_refptr<base::SequencedTaskRunner> task_runner_;
+  scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
 
   base::ThreadChecker thread_checker_;
-  base::WeakPtrFactory<UsbDeviceHandleImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(UsbDeviceHandleImpl);
 };