Added minimal support to command buffer for GL_ARB_texture_rectangle

gpu/command_buffer/service/test_helper.h

Index: gpu/command_buffer/service/test_helper.h
===================================================================
--- gpu/command_buffer/service/test_helper.h	(revision 111321)
+++ gpu/command_buffer/service/test_helper.h	(working copy)
@@ -15,11 +15,13 @@
 class TestHelper {
  public:
   static const GLuint kServiceBlackTexture2dId = 701;
-  static const GLuint kServiceBlackTextureCubemapId = 702;
-  static const GLuint kServiceDefaultTexture2dId = 703;
+  static const GLuint kServiceDefaultTexture2dId = 702;
+  static const GLuint kServiceBlackTextureCubemapId = 703;
   static const GLuint kServiceDefaultTextureCubemapId = 704;
-  static const GLuint kServiceDefaultExternalTextureId = 705;
-  static const GLuint kServiceBlackExternalTextureId = 706;
+  static const GLuint kServiceBlackExternalTextureId = 705;
+  static const GLuint kServiceDefaultExternalTextureId = 706;
+  static const GLuint kServiceBlackRectangleTextureId = 707;
+  static const GLuint kServiceDefaultRectangleTextureId = 708;
 
   static const GLint kMaxSamples = 4;
   static const GLint kMaxRenderbufferSize = 1024;
@@ -45,6 +47,9 @@
       ::gfx::MockGLInterface* gl, const char* extensions);
   static void SetupTextureManagerInitExpectations(::gfx::MockGLInterface* gl,
                                                   const char* extensions);
+ private:
+  static void SetupTextureInitializationExpectations(::gfx::MockGLInterface* gl,
+                                                     GLenum target);
 };
 
 }  // namespace gles2