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 4048fed91ee601e211310330b0be004e7087be7c..f5351012ea931b73760056be353a3d64a50fad76 100644
--- a/content/browser/android/content_view_core_impl.cc
+++ b/content/browser/android/content_view_core_impl.cc
@@ -770,6 +770,22 @@ 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())