android: Use hw acceleration in android_webview_shell

android_webview/browser/hardware_renderer.cc

Index: android_webview/browser/hardware_renderer.cc
diff --git a/android_webview/browser/hardware_renderer.cc b/android_webview/browser/hardware_renderer.cc
index 511969e34f0c029d7d4a0256d319e6e2023e4bc9..969610cdb5ac438a1a223a3ac5bc34ebf772fadd 100644
--- a/android_webview/browser/hardware_renderer.cc
+++ b/android_webview/browser/hardware_renderer.cc
@@ -186,6 +186,10 @@ void HardwareRenderer::DrawGL(bool stencil_enabled,
     }
   }
 
+  if (!delegated_layer_) {
+    LOG(INFO) << "no layer";

[no sievers, 2014/07/22 20:53:17]

The SurfaceView might start drawing before the child ever produced a frame.
Can probably inhibit the draw at a higher level instead.

+    return;
+  }
   viewport_.SetSize(draw_info->width, draw_info->height);
   layer_tree_host_->SetViewportSize(viewport_);
   clip_.SetRect(draw_info->clip_left,
@@ -196,7 +200,8 @@ void HardwareRenderer::DrawGL(bool stencil_enabled,
 
   gfx::Transform transform(gfx::Transform::kSkipInitialization);
   transform.matrix().setColMajorf(draw_info->transform);
-  transform.Translate(scroll_offset_.x(), scroll_offset_.y());
+//  transform.Translate(scroll_offset_.x(), scroll_offset_.y());

[no sievers, 2014/07/22 21:00:36]

So here I don't understand why we scroll in the parent compositor and not in the
child. It actually causes problems in this setup.

+  DCHECK(delegated_layer_.get());
   delegated_layer_->SetTransform(transform);
 
   gl_surface_->SetBackingFrameBufferObject(framebuffer_binding_ext);
@@ -206,6 +211,7 @@ void HardwareRenderer::DrawGL(bool stencil_enabled,
     layer_tree_host_->SetNeedsRedrawRect(clip_);
     layer_tree_host_->Composite(gfx::FrameTime::Now());
   }
+  DCHECK(gl_surface_.get());
   gl_surface_->ResetBackingFrameBufferObject();
 }