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

content/browser/renderer_host/render_widget_host_view_android.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/browser/renderer_host/render_widget_host_view_android.h"
 
 #include <android/bitmap.h>
 #include <utility>
 
 #include "base/android/build_info.h"
@@ skipping 598 matching lines @@
   while (locks_on_frame_count_ > 0) {
     UnlockCompositingSurface();
   }
   RunAckCallbacks(cc::SurfaceDrawStatus::DRAW_SKIPPED);
 }
 
 gfx::Rect RenderWidgetHostViewAndroid::GetViewBounds() const {
   if (!content_view_core_)
     return gfx::Rect(default_size_);
 
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableOSKOverscroll))
+    return gfx::Rect(content_view_core_->GetViewSizeWithOSKHidden());
+
   return gfx::Rect(content_view_core_->GetViewSize());
 }
 
+gfx::Size RenderWidgetHostViewAndroid::GetVisibleViewportSize() const {
+  if (!content_view_core_)
+    return gfx::Rect(default_size_).size();
+
+  return gfx::Rect(content_view_core_->GetViewSize()).size();
+}
+
 gfx::Size RenderWidgetHostViewAndroid::GetPhysicalBackingSize() const {
   if (!content_view_core_)
     return gfx::Size();
 
   return content_view_core_->GetPhysicalBackingSize();
 }
 
 bool RenderWidgetHostViewAndroid::DoTopControlsShrinkBlinkSize() const {
   if (!content_view_core_)
     return false;
@@ skipping 1414 matching lines @@
   results->orientationAngle = display.RotationAsDegree();
   results->orientationType =
       RenderWidgetHostViewBase::GetOrientationTypeForMobile(display);
   gfx::DeviceDisplayInfo info;
   results->depth = info.GetBitsPerPixel();
   results->depthPerComponent = info.GetBitsPerComponent();
   results->isMonochrome = (results->depthPerComponent == 0);
 }
 
 }  // namespace content