Make sure the IME composition is canceled before forwarding the mouse pressed event.

content/browser/renderer_host/render_widget_host_view_aura.h

 // 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 366 matching lines @@
                            DiscardDelegatedFramesWithLocking);
   FRIEND_TEST_ALL_PREFIXES(RenderWidgetHostViewAuraTest, SoftwareDPIChange);
   FRIEND_TEST_ALL_PREFIXES(RenderWidgetHostViewAuraTest,
                            UpdateCursorIfOverSelf);
   FRIEND_TEST_ALL_PREFIXES(RenderWidgetHostViewAuraCopyRequestTest,
                            DestroyedAfterCopyRequest);
   FRIEND_TEST_ALL_PREFIXES(RenderWidgetHostViewAuraTest,
                            VisibleViewportTest);
   FRIEND_TEST_ALL_PREFIXES(RenderWidgetHostViewAuraTest,
                            OverscrollResetsOnBlur);
+  FRIEND_TEST_ALL_PREFIXES(RenderWidgetHostViewAuraTest,
+                           FinishCompositionByMouse);
   FRIEND_TEST_ALL_PREFIXES(WebContentsViewAuraTest,
                            WebContentsViewReparent);
 
   class WindowObserver;
   friend class WindowObserver;
 
   void UpdateCursorIfOverSelf();
 
   // Tracks whether SnapToPhysicalPixelBoundary() has been called.
   bool has_snapped_to_boundary() { return has_snapped_to_boundary_; }
@@ skipping 226 matching lines @@
   // view, so we can ensure the window hasn't moved between copying from the
   // compositing surface and showing the disambiguation popup.
   gfx::Vector2dF disambiguation_scroll_offset_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAura);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_