Create a single-level SRV when not mipmapping.

BUG=angle:596

Change-Id: Iec5a9e43a23c0743ff8b01985a86a72c5f18a7f7
Reviewed-on: https://chromium-review.googlesource.com/192052
Tested-by: Nicolas Capens <nicolascapens@chromium.org>
Reviewed-by: Shannon Woods <shannonwoods@chromium.org>
diff --git a/src/libGLESv2/Texture.h b/src/libGLESv2/Texture.h
index 4348c8a..143f7ac 100644
--- a/src/libGLESv2/Texture.h
+++ b/src/libGLESv2/Texture.h
@@ -57,6 +57,8 @@
     IMPLEMENTATION_MAX_TEXTURE_LEVELS = 15   // 1+log2 of MAX_TEXTURE_SIZE
 };
 
+bool IsMipmapFiltered(const SamplerState &samplerState);
+
 class Texture : public RefCountObject
 {
   public: