Resize only the virtual viewport when the OSK triggers a resize.

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 b124c14d7bef8fbd1ced45a41bb5c842ec2bdb23..53032a70712b3c9b631dd91c8d0441d10995b5ca 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -932,6 +932,9 @@ const char kRemoteDebuggingSocketName[]     = "remote-debugging-socket-name";
 // Block ChildProcessMain thread of the renderer's ChildProcessService until a
 // Java debugger is attached.
 const char kRendererWaitForJavaDebugger[] = "renderer-wait-for-java-debugger";
+
+// Enables overscrolling for the OSK on Android.
+const char kEnableOSKOverscroll[]               = "enable-osk-overscroll";
 #endif
 
 // Enable the aggressive flushing of DOM Storage to minimize data loss.