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

content/browser/android/content_view_core_impl.cc

Index: content/browser/android/content_view_core_impl.cc
diff --git a/content/browser/android/content_view_core_impl.cc b/content/browser/android/content_view_core_impl.cc
index 71bde17b44c3d978dee81d1b5c9e99ab48666b4f..77a07e894943635f8212d56531d766fce8278519 100644
--- a/content/browser/android/content_view_core_impl.cc
+++ b/content/browser/android/content_view_core_impl.cc
@@ -750,6 +750,22 @@ ScopedJavaLocalRef<jobject> ContentViewCoreImpl::GetContext() const {
   return Java_ContentViewCore_getContext(env, obj.obj());
 }
 
+gfx::Size ContentViewCoreImpl::GetViewSizeWithOSKHidden() const {
+  gfx::Size size_pix;
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> j_obj = java_ref_.get(env);
+  if (j_obj.is_null())
+    return size_pix = gfx::Size();
+  size_pix = gfx::Size(
+      Java_ContentViewCore_getViewportWidthPix(env, j_obj.obj()),
+      Java_ContentViewCore_getViewportHeightWithOSKHiddenPix(env, j_obj.obj()));
+
+  gfx::Size size_dip = gfx::ScaleToCeiledSize(size_pix, 1.0f / dpi_scale());
+  if (DoTopControlsShrinkBlinkSize())
+    size_dip.Enlarge(0, -GetTopControlsHeightDip());
+  return size_dip;
+}
+
 gfx::Size ContentViewCoreImpl::GetViewSize() const {
   gfx::Size size = GetViewportSizeDip();
   if (DoTopControlsShrinkBlinkSize())