Added experiment for changing viewport scroll ordering.

content/public/common/content_switches.cc

 // Copyright (c) 2012 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 "content/public/common/content_switches.h"
 
 namespace switches {
 
 // The number of MSAA samples for canvas2D. Requires MSAA support by GPU to
 // have an effect. 0 disables MSAA.
@@ skipping 470 matching lines @@
 
 // Enables the use of the @viewport CSS rule, which allows
 // pages to control aspects of their own layout. This also turns on touch-screen
 // pinch gestures.
 const char kEnableViewport[]                = "enable-viewport";
 
 // Enables the viewport meta tag, the de facto way to control layout which works
 // only on mobile browsers.
 const char kEnableViewportMeta[]            = "enable-viewport-meta";
 
-// Resizes of the main frame are the caused by changing between landscape
-// and portrait mode (i.e. Android) so the page should be rescaled to fit
-const char kMainFrameResizesAreOrientationChanges[] =
-    "main-frame-resizes-are-orientation-changes";
+// Enables experiment to scroll the inner viewport first in some situations.
+const char kEnableViewportScrollOrderExperiment[] =
+    "enable-viewport-scroll-order-experiment";

[aelias_OOO_until_Jul13, 2015/06/09 04:02:44]

I think "invert-viewport-scroll-order" would be clearer and more concise?

[bokan, 2015/06/09 11:49:04]

sgtm, done.

 
 // Enable the Vtune profiler support.
 const char kEnableVtune[]                   = "enable-vtune-support";
 
 // Enables WebGL extensions not yet approved by the community.
 const char kEnableWebGLDraftExtensions[] = "enable-webgl-draft-extensions";
 
 // Enables WebGL rendering into a scanout buffer for overlay support.
 const char kEnableWebGLImageChromium[] = "enable-webgl-image-chromium";
 
@@ skipping 96 matching lines @@
 // Sets the minimum log level. Valid values are from 0 to 3:
 // INFO = 0, WARNING = 1, LOG_ERROR = 2, LOG_FATAL = 3.
 const char kLoggingLevel[]                  = "log-level";
 
 // Enables saving net log events to a file and sets the file name to use.
 const char kLogNetLog[]                     = "log-net-log";
 
 // Make plugin processes log their sent and received messages to VLOG(1).
 const char kLogPluginMessages[]             = "log-plugin-messages";
 
+// Resizes of the main frame are the caused by changing between landscape
+// and portrait mode (i.e. Android) so the page should be rescaled to fit
+const char kMainFrameResizesAreOrientationChanges[] =
+    "main-frame-resizes-are-orientation-changes";
+
 // Sets the width and height above which a composited layer will get tiled.
 const char kMaxUntiledLayerHeight[]         = "max-untiled-layer-height";
 const char kMaxUntiledLayerWidth[]          = "max-untiled-layer-width";
 
 // Sample memory usage with high frequency and store the results to the
 // Renderer.Memory histogram. Used in memory tests.
 const char kMemoryMetrics[]                 = "memory-metrics";
 
 // Mutes audio sent to the audio device so it is not audible during
 // automated testing.
@@ skipping 394 matching lines @@
 // Windows Vista and later.
 const char kTraceExportEventsToETW[] = "trace-export-events-to-etw";
 #endif
 
 // Enables the use of NPAPI plugins.
 const char kEnableNpapiForTesting[] = "enable-npapi-for-testing";
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches