[android_webview] Update max scroll offset from page scale change.

android_webview/browser/browser_view_renderer.cc

 // Copyright 2014 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 "android_webview/browser/browser_view_renderer.h"
 
 #include "android_webview/browser/browser_view_renderer_client.h"
 #include "android_webview/browser/shared_renderer_state.h"
 #include "android_webview/public/browser/draw_gl.h"
 #include "base/android/jni_android.h"
@@ skipping 426 matching lines @@
                    ui_thread_weak_ptr_,
                    page_scale_factor,
                    min_page_scale_factor,
                    max_page_scale_factor));
     return;
   }
   page_scale_factor_ = page_scale_factor;
   DCHECK_GT(page_scale_factor_, 0);
   client_->SetPageScaleFactorAndLimits(
       page_scale_factor, min_page_scale_factor, max_page_scale_factor);
+  client_->SetMaxContainerViewScrollOffset(max_scroll_offset());
 }
 
 void BrowserViewRenderer::SetRootLayerScrollableSize(
     gfx::SizeF scrollable_size) {
   if (!ui_task_runner_->BelongsToCurrentThread()) {
     ui_task_runner_->PostTask(
         FROM_HERE,
         base::Bind(&BrowserViewRenderer::SetRootLayerScrollableSize,
                    ui_thread_weak_ptr_,
                    scrollable_size));
@@ skipping 136 matching lines @@
     base::StringAppendF(&str,
                         "surface width height: [%d %d] ",
                         draw_info->width,
                         draw_info->height);
     base::StringAppendF(&str, "is_layer: %d ", draw_info->is_layer);
   }
   return str;
 }
 
 }  // namespace android_webview