Implement serial API for Windows.

base/platform_file.h

Index: base/platform_file.h
diff --git a/base/platform_file.h b/base/platform_file.h
index 2bfd181a16c7c0f960356710d735c2c70c4a764f..0506bc3b8f6a4a46aeba90b8d5b0270eb37bc6fa 100644
--- a/base/platform_file.h
+++ b/base/platform_file.h
@@ -32,26 +32,29 @@ const PlatformFile kInvalidPlatformFileValue = -1;
 // exactly one of the five (possibly combining with other flags) when opening
 // or creating a file.
 enum PlatformFileFlags {
-  PLATFORM_FILE_OPEN = 1,             // Opens a file, only if it exists.
-  PLATFORM_FILE_CREATE = 2,           // Creates a new file, only if it does not
-                                      // already exist.
-  PLATFORM_FILE_OPEN_ALWAYS = 4,      // May create a new file.
-  PLATFORM_FILE_CREATE_ALWAYS = 8,    // May overwrite an old file.
-  PLATFORM_FILE_OPEN_TRUNCATED = 16,  // Opens a file and truncates it, only if
-                                      // it exists.
-  PLATFORM_FILE_READ = 32,
-  PLATFORM_FILE_WRITE = 64,
-  PLATFORM_FILE_EXCLUSIVE_READ = 128,  // EXCLUSIVE is opposite of Windows SHARE
-  PLATFORM_FILE_EXCLUSIVE_WRITE = 256,
-  PLATFORM_FILE_ASYNC = 512,
-  PLATFORM_FILE_TEMPORARY = 1024,       // Used on Windows only
-  PLATFORM_FILE_HIDDEN = 2048,          // Used on Windows only
-  PLATFORM_FILE_DELETE_ON_CLOSE = 4096,
-
-  PLATFORM_FILE_WRITE_ATTRIBUTES = 8192,  // Used on Windows only
-  PLATFORM_FILE_ENUMERATE = 16384,  // May enumerate directory
-
-  PLATFORM_FILE_SHARE_DELETE = 32768,  // Used on Windows only
+  PLATFORM_FILE_OPEN = 1 << 0,             // Opens a file, only if it exists.
+  PLATFORM_FILE_CREATE = 1 << 1,           // Creates a new file, only if it
+                                           // does not already exist.
+  PLATFORM_FILE_OPEN_ALWAYS = 1 << 2,      // May create a new file.
+  PLATFORM_FILE_CREATE_ALWAYS = 1 << 3,    // May overwrite an old file.
+  PLATFORM_FILE_OPEN_TRUNCATED = 1 << 4,   // Opens a file and truncates it,
+                                           // only if it exists.
+  PLATFORM_FILE_READ = 1 << 5,
+  PLATFORM_FILE_WRITE = 1 << 6,
+  PLATFORM_FILE_EXCLUSIVE_READ = 1 << 7,   // EXCLUSIVE is opposite of Windows
+                                           // SHARE
+  PLATFORM_FILE_EXCLUSIVE_WRITE = 1 << 8,
+  PLATFORM_FILE_ASYNC = 1 << 9,
+  PLATFORM_FILE_TEMPORARY = 1 << 10,       // Used on Windows only
+  PLATFORM_FILE_HIDDEN = 1 << 11,          // Used on Windows only
+  PLATFORM_FILE_DELETE_ON_CLOSE = 1 << 12,
+
+  PLATFORM_FILE_WRITE_ATTRIBUTES = 1 << 13,  // Used on Windows only
+  PLATFORM_FILE_ENUMERATE = 1 << 14,         // May enumerate directory
+
+  PLATFORM_FILE_SHARE_DELETE = 1 << 15,      // Used on Windows only
+
+  PLATFORM_FILE_TERMINAL_DEVICE = 1 << 16,   // Serial port flags
 };
 
 // PLATFORM_FILE_ERROR_ACCESS_DENIED is returned when a call fails because of