Record Data Savings for Client-Side LoFi

content/public/common/previews_state.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_COMMON_PREVIEWS_TYPE_H_
 #define CONTENT_PUBLIC_COMMON_PREVIEWS_TYPE_H_
 
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/WebURLRequest.h"
 
 #define STATIC_ASSERT_PREVIEWS_ENUM(a, b)                   \
   static_assert(static_cast<int>(a) == static_cast<int>(b), \
                 "mismatching enums: " #a)
 
 namespace content {
 
 // Chrome Proxy Previews header and directives.
 const char kChromeProxyContentTransformHeader[] =
     "chrome-proxy-content-transform";
 const char kChromeProxyEmptyImageDirective[] = "empty-image";
 const char kChromeProxyLitePageDirective[] = "lite-page";
 
 typedef int PreviewsState;
 
 // The Previews types which determines whether to request a Preview version of
 // the resource. Previews are optimizations that change the format and
 // content of web pages to improve data savings and / or performance. This enum
 // determines which Previews types to request.
 enum PreviewsTypes {
-  PREVIEWS_UNSPECIFIED = 0,        // Let the browser process decide whether or
-                                   // not to request Preview types.
-  SERVER_LOFI_ON = 1 << 0,         // Request a Lo-Fi version of the resource
-                                   // from the server.
-  CLIENT_LOFI_ON = 1 << 1,         // Request a Lo-Fi version of the resource
-                                   // from the client.
-  SERVER_LITE_PAGE_ON = 1 << 2,    // Request a Lite Page version of the
-                                   // resource from the server.
-  PREVIEWS_NO_TRANSFORM = 1 << 3,  // Explicitly forbid Previews
-                                   // transformations.
-  PREVIEWS_OFF = 1 << 4,           // Request a normal (non-Preview) version of
-                                   // the resource. Server transformations may
-                                   // still happen if the page is heavy.
+  PREVIEWS_UNSPECIFIED = 0,  // Let the browser process decide whether or
+                             // not to request Preview types.
+  SERVER_LOFI_ON = 1 << 0,   // Request a Lo-Fi version of the resource
+                             // from the server.
+  CLIENT_LOFI_ON = 1 << 1,   // Request a Lo-Fi version of the resource
+                             // from the client.
+  CLIENT_LOFI_AUTO_RELOAD = 1 << 2,  // Request the original version of the

[RyanSturm, 2017/05/10 18:14:09]

tiny nit: these comments don't line up well. Does git cl format leave it this
way? Feel free to leave it.

[sclittle, 2017/05/10 19:56:37]

git cl format left it this way; I agree it looks kinda bad, but hopefully it's
still readable enough.

+                                     // resource after a decoding error occurred
+                                     // when attempting to use Client Lo-Fi.
+  SERVER_LITE_PAGE_ON = 1 << 3,      // Request a Lite Page version of the
+                                     // resource from the server.
+  PREVIEWS_NO_TRANSFORM = 1 << 4,    // Explicitly forbid Previews
+                                     // transformations.
+  PREVIEWS_OFF = 1 << 5,  // Request a normal (non-Preview) version of
+                          // the resource. Server transformations may
+                          // still happen if the page is heavy.
   PREVIEWS_STATE_LAST = PREVIEWS_OFF
 };
 
 // Ensure that content::PreviewsState and blink::WebURLRequest::PreviewsState
 // are kept in sync.
 STATIC_ASSERT_PREVIEWS_ENUM(PREVIEWS_UNSPECIFIED,
                             blink::WebURLRequest::kPreviewsUnspecified);
 STATIC_ASSERT_PREVIEWS_ENUM(SERVER_LOFI_ON,
                             blink::WebURLRequest::kServerLoFiOn);
 STATIC_ASSERT_PREVIEWS_ENUM(CLIENT_LOFI_ON,
                             blink::WebURLRequest::kClientLoFiOn);
+STATIC_ASSERT_PREVIEWS_ENUM(CLIENT_LOFI_AUTO_RELOAD,
+                            blink::WebURLRequest::kClientLoFiAutoReload);
 STATIC_ASSERT_PREVIEWS_ENUM(SERVER_LITE_PAGE_ON,
                             blink::WebURLRequest::kServerLitePageOn);
 STATIC_ASSERT_PREVIEWS_ENUM(PREVIEWS_NO_TRANSFORM,
                             blink::WebURLRequest::kPreviewsNoTransform);
 STATIC_ASSERT_PREVIEWS_ENUM(PREVIEWS_OFF, blink::WebURLRequest::kPreviewsOff);
 STATIC_ASSERT_PREVIEWS_ENUM(PREVIEWS_STATE_LAST,
                             blink::WebURLRequest::kPreviewsStateLast);
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_PREVIEWS_TYPE_H_