Implement CreateDefaultTextureView by CreateTextureView

This patch removes CreateDefaultTextureView in all the back-ends of
class Device and implements this function by CreateTextureView using
a TextureViewDescriptor created from the original texture.

Note that this patch only refactors the original implementation of
creating default texture. The support of creating texture views from
a texture view descriptor will be added in the next several patches.

BUG=dawn:16

Change-Id: Iadfc1e17e1cf23a4c1fa8ff44b1fb1a765d21e3f
Reviewed-on: https://dawn-review.googlesource.com/c/1840
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>

src/dawn_native/opengl/TextureGL.cpp

@@ -129,7 +129,9 @@ namespace dawn_native { namespace opengl {
 
     // TextureView
 
-    TextureView::TextureView(TextureBase* texture) : TextureViewBase(texture) {
+    // TODO(jiawei.shao@intel.com): create texture view by TextureViewDescriptor
+    TextureView::TextureView(TextureBase* texture, const TextureViewDescriptor* descriptor)
+        : TextureViewBase(texture, descriptor) {
     }
 
 }}  // namespace dawn_native::opengl