16-bit video upload to float: intermediate R16_EXT and copy to float.

gpu/command_buffer/service/texture_manager.cc

Index: gpu/command_buffer/service/texture_manager.cc
diff --git a/gpu/command_buffer/service/texture_manager.cc b/gpu/command_buffer/service/texture_manager.cc
index 68cd6bf3e182ae549100085bb16a2ca101962ac9..d7f45c5491b19498b525f3e4da8f996e3ef5404c 100644
--- a/gpu/command_buffer/service/texture_manager.cc
+++ b/gpu/command_buffer/service/texture_manager.cc
@@ -216,6 +216,9 @@ class FormatTypeValidator {
         // Exposed by GL_APPLE_texture_format_BGRA8888 and
         // GL_EXT_texture_format_BGRA8888
         {GL_BGRA_EXT, GL_BGRA_EXT, GL_UNSIGNED_BYTE},
+
+        // Exposed by GL_EXT_texture_norm16
+        {GL_R16_EXT, GL_RED, GL_UNSIGNED_SHORT},
     };
 
     static const FormatType kSupportedFormatTypesES2Only[] = {