Fix use_image_texture_target inconsistencies

cc/test/test_image_texture_targets_map.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+#include "cc/test/test_image_texture_targets_map.h"
+
+#include "gpu/GLES2/gl2extchromium.h"
+#include "ui/gfx/buffer_types.h"
+
+namespace cc {
+
+RendererSettings::ImageTextureTargetsMap TestImageTextureTargetsMap() {
+  RendererSettings::ImageTextureTargetsMap image_targets;
+  for (size_t usage_idx = 0;
+       usage_idx <= static_cast<size_t>(gfx::BufferUsage::LAST) + 1;
+       ++usage_idx) {
+    gfx::BufferUsage usage = static_cast<gfx::BufferUsage>(usage_idx);
+    for (size_t format_idx = 0;
+         format_idx < static_cast<size_t>(gfx::BufferFormat::LAST) + 1;
+         ++format_idx) {
+      gfx::BufferFormat format = static_cast<gfx::BufferFormat>(format_idx);
+      image_targets.emplace(
+          RendererSettings::ImageTextureTargetKey(usage, format),
+          GL_TEXTURE_2D);
+    }
+  }
+
+  return image_targets;
+}
+
+}  // namespace cc