Refactor CopyTexture method determination

gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.cc

Index: gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.cc b/gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.cc
index d310095abde33f891578a549c06f7921ccaad4f0..4ac99a4a32743af7d124b6ea67dea696ff640f21 100644
--- a/gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.cc
+++ b/gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.cc
@@ -718,16 +718,7 @@ void CopyTextureCHROMIUMResourceManager::DoCopyTexture(
     bool premultiply_alpha,
     bool unpremultiply_alpha,
     CopyTextureMethod method) {
-  bool premultiply_alpha_change = premultiply_alpha ^ unpremultiply_alpha;
-  GLenum dest_binding_target =
-      gpu::gles2::GLES2Util::GLFaceTargetToTextureTarget(dest_target);
-
-  // GL_TEXTURE_RECTANGLE_ARB on FBO is supported by OpenGL, not GLES2,
-  // so restrict this to GL_TEXTURE_2D and GL_TEXTURE_CUBE_MAP.
-  if (source_target == GL_TEXTURE_2D &&
-      (dest_binding_target == GL_TEXTURE_2D ||
-       dest_binding_target == GL_TEXTURE_CUBE_MAP) &&
-      !flip_y && !premultiply_alpha_change && method == DIRECT_COPY) {
+  if (method == DIRECT_COPY) {
     DoCopyTexImage2D(decoder, source_target, source_id, source_level,
                      dest_target, dest_id, dest_level, dest_internal_format,
                      width, height, framebuffer_);
@@ -796,16 +787,7 @@ void CopyTextureCHROMIUMResourceManager::DoCopySubTexture(
     bool premultiply_alpha,
     bool unpremultiply_alpha,
     CopyTextureMethod method) {
-  bool premultiply_alpha_change = premultiply_alpha ^ unpremultiply_alpha;
-  GLenum dest_binding_target =
-      gpu::gles2::GLES2Util::GLFaceTargetToTextureTarget(dest_target);
-
-  // GL_TEXTURE_RECTANGLE_ARB on FBO is supported by OpenGL, not GLES2,
-  // so restrict this to GL_TEXTURE_2D and GL_TEXTURE_CUBE_MAP.
-  if (source_target == GL_TEXTURE_2D &&
-      (dest_binding_target == GL_TEXTURE_2D ||
-       dest_binding_target == GL_TEXTURE_CUBE_MAP) &&
-      !flip_y && !premultiply_alpha_change && method == DIRECT_COPY) {
+  if (method == DIRECT_COPY) {
     DoCopyTexSubImage2D(decoder, source_target, source_id, source_level,
                         dest_target, dest_id, dest_level, xoffset, yoffset, x,
                         y, width, height, framebuffer_);