Split AdbWinApi.dll into two dlls to remove dependency on WINUSB.DLL

Move all WINUSB-dependent functionality into AdbWinUsbApi.dll in order to
enable ADB on condition that WINUSB has not been installed.
In this patch set new file (adb_winusb_api.h) has been added where I moved
typedef that broke the build. Aso, adb_api.cpp and AdbWinApi.cpp were changed
to include that new header file.
BUG 2033924

host/windows/usb/api/adb_api.cpp

@@ -24,11 +24,19 @@
 #include "adb_object_handle.h"
 #include "adb_interface_enum.h"
 #include "adb_interface.h"
-#include "adb_winusb_interface.h"
 #include "adb_legacy_interface.h"
 #include "adb_endpoint_object.h"
 #include "adb_io_completion.h"
 #include "adb_helper_routines.h"
+#include "adb_winusb_api.h"
+
+/** \brief Points to InstantiateWinUsbInterface exported from AdbWinUsbApi.dll.
+
+  This variable is initialized with the actual address in DllMain routine for
+  this DLL on DLL_PROCESS_ATTACH event.
+  @see PFN_INSTWINUSBINTERFACE for more information.
+*/
+PFN_INSTWINUSBINTERFACE InstantiateWinUsbInterface = NULL;
 
 ADBAPIHANDLE __cdecl AdbEnumInterfaces(GUID class_id,
                                bool exclude_not_present,
@@ -101,11 +109,22 @@ ADBAPIHANDLE __cdecl AdbCreateInterfaceByName(
   ADBAPIHANDLE ret = NULL;
 
   try {
-    // Instantiate object
+    // Instantiate interface object, depending on the USB driver type.
     if (IsLegacyInterface(interface_name)) {
+      // We have legacy USB driver underneath us.
       obj = new AdbLegacyInterfaceObject(interface_name);
     } else {
-      obj = new AdbWinUsbInterfaceObject(interface_name);
+      // We have WinUsb driver underneath us. Make sure that AdbWinUsbApi.dll
+      // is loaded and its InstantiateWinUsbInterface routine address has
+      // been cached.
+      if (NULL != InstantiateWinUsbInterface) {
+        obj = InstantiateWinUsbInterface(interface_name);
+        if (NULL == obj) {
+          return NULL;
+        }
+      } else {
+        return NULL;
+      }
     }
 
     // Create handle for it