ui/gl: On a core profile use sized types for R32F and RG32F

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 b3a516a40c6e816032202ce9b21c20dad83647fa..7d2210a548e1efe5a13cdb44f081976d9a11d71d 100644
--- a/ui/gl/gl_gl_api_implementation.cc
+++ b/ui/gl/gl_gl_api_implementation.cc
@@ -141,6 +141,14 @@ static inline GLenum GetTexInternalFormat(GLenum internal_format,
       case GL_ALPHA:
         gl_internal_format = GL_ALPHA32F_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_R32F;
+        break;
+      case GL_RG:
+        gl_internal_format = GL_RG32F;
+        break;
       default:
         // We can't assert here because if the client context is ES3,
         // all sized internal_format will reach here.