cc: Only use single quad pass optimization when quad rect matches pass rect

cc/output/gl_renderer.cc

 // Copyright 2010 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/output/gl_renderer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 978 matching lines @@
 const TileDrawQuad* GLRenderer::CanPassBeDrawnDirectly(const RenderPass* pass) {
   // Can only collapse a single tile quad.
   if (pass->quad_list.size() != 1)
     return nullptr;
   // If we need copy requests, then render pass has to exist.
   if (!pass->copy_requests.empty())
     return nullptr;
 
   const DrawQuad* quad = *pass->quad_list.BackToFrontBegin();
   // Hack: this could be supported by concatenating transforms, but
-  // in practice if there is one quad, it is at the origin of the render pass.
-  if (!quad->shared_quad_state->quad_to_target_transform.IsIdentity())
+  // in practice if there is one quad, it is at the origin of the render pass
+  // and has the same size as the pass.
+  if (!quad->shared_quad_state->quad_to_target_transform.IsIdentity() ||
+      quad->rect != pass->output_rect)
     return nullptr;
   // The quad is expected to be the entire layer so that AA edges are correct.
   if (gfx::Rect(quad->shared_quad_state->quad_layer_bounds) != quad->rect)
     return nullptr;
   if (quad->material != DrawQuad::TILED_CONTENT)
     return nullptr;
 
   const TileDrawQuad* tile_quad = TileDrawQuad::MaterialCast(quad);
   // Hack: this could be supported by passing in a subrectangle to draw
   // render pass, although in practice if there is only one quad there
@@ skipping 3030 matching lines @@
   // The alpha has already been applied when copying the RPDQ to an IOSurface.
   GLfloat alpha = 1;
   gl_->ScheduleCALayerSharedStateCHROMIUM(alpha, is_clipped, clip_rect,
                                           sorting_context_id, gl_transform);
   gl_->ScheduleCALayerCHROMIUM(
       texture_id, contents_rect, ca_layer_overlay->background_color,
       ca_layer_overlay->edge_aa_mask, bounds_rect, filter);
 }
 
 }  // namespace cc