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-rw-r--r--net/base/request_priority.cc67
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diff --git a/net/base/request_priority.cc b/net/base/request_priority.cc
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--- a/net/base/request_priority.cc
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-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
-// Copyright (c) 2012, Code Aurora Forum. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "net/base/request_priority.h"
-#include "base/logging.h"
-
-namespace net {
-
-RequestPriority DetermineRequestPriority(ResourceType::Type type)
-{
- //__android_log_print(ANDROID_LOG_VERBOSE, "Preload", "DetermineRequestPriority, type = %d", type);
-
- // Determine request priority based on how critical this resource typically
- // is to user-perceived page load performance. Important considerations are:
- // * Can this resource block the download of other resources.
- // * Can this resource block the rendering of the page.
- // * How useful is the page to the user if this resource is not loaded yet.
- switch (type) {
- // Main frames are the highest priority because they can block nearly every
- // type of other resource and there is no useful display without them.
- // Sub frames are a close second, however it is a common pattern to wrap
- // ads in an iframe or even in multiple nested iframes. It is worth
- // investigating if there is a better priority for them.
- case ResourceType::MAIN_FRAME:
- case ResourceType::SUB_FRAME:
- return HIGHEST;
-
- // Stylesheets and scripts can block rendering and loading of other
- // resources. Fonts can block text from rendering.
- case ResourceType::STYLESHEET:
- case ResourceType::SCRIPT:
- case ResourceType::FONT_RESOURCE:
- return MEDIUM;
-
- // Sub resources, objects and media are lower priority than potentially
- // blocking stylesheets, scripts and fonts, but are higher priority than
- // images because if they exist they are probably more central to the page
- // focus than images on the page.
- case ResourceType::SUB_RESOURCE:
- case ResourceType::OBJECT:
- case ResourceType::MEDIA:
- case ResourceType::WORKER:
- case ResourceType::SHARED_WORKER:
- return LOW;
-
- // Images are the "lowest" priority because they typically do not block
- // downloads or rendering and most pages have some useful content without
- // them.
- case ResourceType::IMAGE:
- return LOWEST;
-
- // Prefetches are at a lower priority than even LOWEST, since they
- // are not even required for rendering of the current page.
- case ResourceType::PREFETCH:
- return IDLE;
-
- default:
- // When new resource types are added, their priority must be considered.
- NOTREACHED();
- return LOW;
- }
-}
-
-} // namespace net
-