Implement transform/clip support for Android WebView.

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 <algorithm>
 #include <limits>
 #include <set>
 #include <string>
@@ skipping 2356 matching lines @@
       make_scoped_ptr(new ResourceProvider::ScopedWriteLockGL(
           resource_provider_, texture->id()));
   unsigned texture_id = current_framebuffer_lock_->texture_id();
   GLC(context_,
       context_->framebufferTexture2D(
           GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture_id, 0));
 
   DCHECK(context_->checkFramebufferStatus(GL_FRAMEBUFFER) ==
          GL_FRAMEBUFFER_COMPLETE || IsContextLost());
 
-  InitializeMatrices(frame, framebuffer_rect, false);
+  InitializeMatrices(frame, gfx::Vector2d(), framebuffer_rect, false);
   SetDrawViewportSize(framebuffer_rect.size());
 
   return true;
 }
 
 void GLRenderer::SetScissorTestRect(gfx::Rect scissor_rect) {
   EnsureScissorTestEnabled();
 
   // Don't unnecessarily ask the context to change the scissor, because it
   // may cause undesired GPU pipeline flushes.
   if (scissor_rect == scissor_rect_)
     return;
 
   scissor_rect_ = scissor_rect;
   FlushTextureQuadCache();
   GLC(context_,
       context_->scissor(scissor_rect.x(),
                         scissor_rect.y(),
                         scissor_rect.width(),
                         scissor_rect.height()));
 }
 
 void GLRenderer::SetDrawViewportSize(gfx::Size viewport_size) {
   current_framebuffer_size_ = viewport_size;
   GLC(context_,
-      context_->viewport(0, 0, viewport_size.width(), viewport_size.height()));
+      context_->viewport(client_->DeviceViewportOffset().x(),
+                         client_->DeviceViewportOffset().y(),
+                         viewport_size.width(),
+                         viewport_size.height()));
 }
 
 bool GLRenderer::MakeContextCurrent() { return context_->makeContextCurrent(); }
 
 bool GLRenderer::InitializeSharedObjects() {
   TRACE_EVENT0("cc", "GLRenderer::InitializeSharedObjects");
   MakeContextCurrent();
 
   // Create an FBO for doing offscreen rendering.
   GLC(context_, offscreen_framebuffer_id_ = context_->createFramebuffer());
@@ skipping 498 matching lines @@
   // The Skia GPU backend requires a stencil buffer.  See ReinitializeGrCanvas
   // implementation.
   return gr_context_ && context_->getContextAttributes().stencil;
 }
 
 bool GLRenderer::IsContextLost() {
   return (context_->getGraphicsResetStatusARB() != GL_NO_ERROR);
 }
 
 }  // namespace cc