[Android] Upstream the WebView find-in-page API implementation.

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 1126f02f5754967dc06bd90cfd79053149973674..7039ed804a79ecd35d29aac3b372f3b9e51d075b 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -651,6 +651,7 @@ const char kMediaPlayerInRenderProcess[]    = "media-player-in-render-process";
 
 // Set when Chromium should use a mobile user agent.
 const char kUseMobileUserAgent[] = "use-mobile-user-agent";
+
 // Omnibus flag setting an Android graphics mode.  May be:
 //   "basic" (untiled software path)
 //   "compositor" (hardware-accelerated compositing),
@@ -660,6 +661,9 @@ const char kGraphicsModeValueCompositor[]   = "compositor";
 
 // The telephony region (ISO country code) to use in phone number detection.
 const char kNetworkCountryIso[] = "network-country-iso";
+
+// Set to enable compatibility with legacy WebView synchronous APIs.
+const char kEnableWebViewSynchronousAPIs[] = "enable-webview-synchronous-apis";
 #endif
 
 #if defined(OS_POSIX)