cc: Fix invalid opaque debug quads

cc/layers/layer_impl.cc

 // Copyright 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 "cc/layers/layer_impl.h"
 
 #include "base/json/json_reader.h"
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
@@ skipping 334 matching lines @@
       shared_quad_state, quad_rect, visible_quad_rect, color, width);
   if (contents_opaque()) {
     // When opaque, draw a second inner border that is thicker than the outer
     // border, but more transparent.
     static const float kFillOpacity = 0.3f;
     SkColor fill_color = SkColorSetA(
         color, static_cast<uint8_t>(SkColorGetA(color) * kFillOpacity));
     float fill_width = width * 3;
     gfx::Rect fill_rect = quad_rect;
     fill_rect.Inset(fill_width / 2.f, fill_width / 2.f);
+    if (fill_rect.IsEmpty())
+      return;
     gfx::Rect visible_fill_rect =
         gfx::IntersectRects(visible_quad_rect, fill_rect);
     DebugBorderDrawQuad* fill_quad =
         render_pass->CreateAndAppendDrawQuad<DebugBorderDrawQuad>();
     fill_quad->SetNew(shared_quad_state, fill_rect, visible_fill_rect,
                       fill_color, fill_width);
   }
 }
 
 bool LayerImpl::HasDelegatedContent() const {
@@ skipping 1251 matching lines @@
   gfx::Transform scaled_draw_transform =
       draw_properties_.target_space_transform;
   scaled_draw_transform.Scale(SK_MScalar1 / scale, SK_MScalar1 / scale);
   gfx::Size scaled_content_bounds =
       gfx::ToCeiledSize(gfx::ScaleSize(content_bounds(), scale));
   return MathUtil::MapEnclosingClippedRect(scaled_draw_transform,
                                            gfx::Rect(scaled_content_bounds));
 }
 
 }  // namespace cc