Update CHROMIUM_copy_texture.txt to match the code

[Overview]
The internal format list in the code mismatches the one in the spec txt.
see the link below for the missing formats in the spec txt:
  - http://screen/vDkHo3MFXpE3eQF.png

Therefore the CL is matching the spec txt to the code.

[Test]
CQ DRY RUN completed and passed

Bug: angleproject:4228
Change-Id: Ib66fb00b65ce2164779ca7649ec0652910a8e467
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3830892
Reviewed-by: Yuxin Hu <yuxinhu@google.com>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>

extensions/CHROMIUM_copy_texture.txt

@@ -178,35 +178,40 @@ Additions to the OpenGL ES 2.0 Specification
 
         <internalFormat>
         ---------------
-        RGB
-        RGBA
-        RGB8
-        RGBA8
-        BGRA_EXT
+        ALPHA
         BGRA8_EXT
-        SRGB_EXT
-        SRGB_ALPHA_EXT
-        R8
-        R8UI
-        RG8
-        RG8UI
-        SRGB8
-        RGB565
-        RGB8UI
-        SRGB8_ALPHA8
-        RGB5_A1
-        RGBA4
-        RGBA8UI
-        RGB9_E5
+        BGRA_EXT
+        LUMINANCE
+        LUMINANCE_ALPHA
+        R11F_G11F_B10F
         R16F
         R32F
+        R8
+        R8UI
         RG16F
         RG32F
+        RG8
+        RG8UI
+        RGB
+        RGB10_A2
         RGB16F
         RGB32F
+        RGB565
+        RGB5_A1
+        RGB8
+        RGB8UI
+        RGB9_E5
+        RGBA
         RGBA16F
         RGBA32F
-        R11F_G11F_B10F
+        RGBA4
+        RGBA8
+        RGBA8UI
+        RGBX8_ANGLE
+        SRGB8
+        SRGB8_ALPHA8
+        SRGB_ALPHA_EXT
+        SRGB_EXT
 
     Table 1.1 Valid source texture internal formats for CopyTextureCHROMIUM and
     source and destination formats for CopySubTextureCHROMIUM:

src/libANGLE/validationES2.cpp

@@ -99,40 +99,40 @@ bool IsValidCopyTextureDestinationInternalFormatEnum(GLint internalFormat)
     // Table 1.0 from the CHROMIUM_copy_texture spec
     switch (internalFormat)
     {
-        case GL_RGB:
-        case GL_RGBA:
-        case GL_RGB8:
-        case GL_RGBA8:
-        case GL_RGBX8_ANGLE:
-        case GL_BGRA_EXT:
+        case GL_ALPHA:
         case GL_BGRA8_EXT:
-        case GL_SRGB_EXT:
-        case GL_SRGB_ALPHA_EXT:
-        case GL_R8:
-        case GL_R8UI:
-        case GL_RG8:
-        case GL_RG8UI:
-        case GL_SRGB8:
-        case GL_RGB565:
-        case GL_RGB8UI:
-        case GL_RGB10_A2:
-        case GL_SRGB8_ALPHA8:
-        case GL_RGB5_A1:
-        case GL_RGBA4:
-        case GL_RGBA8UI:
-        case GL_RGB9_E5:
-        case GL_R16F:
-        case GL_R32F:
-        case GL_RG16F:
-        case GL_RG32F:
-        case GL_RGB16F:
-        case GL_RGB32F:
-        case GL_RGBA16F:
-        case GL_RGBA32F:
-        case GL_R11F_G11F_B10F:
+        case GL_BGRA_EXT:
         case GL_LUMINANCE:
         case GL_LUMINANCE_ALPHA:
-        case GL_ALPHA:
+        case GL_R11F_G11F_B10F:
+        case GL_R16F:
+        case GL_R32F:
+        case GL_R8:
+        case GL_R8UI:
+        case GL_RG16F:
+        case GL_RG32F:
+        case GL_RG8:
+        case GL_RG8UI:
+        case GL_RGB:
+        case GL_RGB10_A2:
+        case GL_RGB16F:
+        case GL_RGB32F:
+        case GL_RGB565:
+        case GL_RGB5_A1:
+        case GL_RGB8:
+        case GL_RGB8UI:
+        case GL_RGB9_E5:
+        case GL_RGBA:
+        case GL_RGBA16F:
+        case GL_RGBA32F:
+        case GL_RGBA4:
+        case GL_RGBA8:
+        case GL_RGBA8UI:
+        case GL_RGBX8_ANGLE:
+        case GL_SRGB8:
+        case GL_SRGB8_ALPHA8:
+        case GL_SRGB_ALPHA_EXT:
+        case GL_SRGB_EXT:
             return true;
 
         default: