Fix oes-texture-half-float.html on core profile GL.

ui/gl/gl_gl_api_implementation.cc

Index: ui/gl/gl_gl_api_implementation.cc
diff --git a/ui/gl/gl_gl_api_implementation.cc b/ui/gl/gl_gl_api_implementation.cc
index c225d9259414b75568934378969fc8ade994acbd..b3a516a40c6e816032202ce9b21c20dad83647fa 100644
--- a/ui/gl/gl_gl_api_implementation.cc
+++ b/ui/gl/gl_gl_api_implementation.cc
@@ -163,6 +163,14 @@ static inline GLenum GetTexInternalFormat(GLenum internal_format,
       case GL_ALPHA:
         gl_internal_format = GL_ALPHA16F_ARB;
         break;
+      // RED and RG are reached here because on Desktop GL core profile,
+      // LUMINANCE/ALPHA formats are emulated through RED and RG in Chrome.
+      case GL_RED:
+        gl_internal_format = GL_R16F;
+        break;
+      case GL_RG:
+        gl_internal_format = GL_RG16F;
+        break;
       default:
         NOTREACHED();
         break;