Mac: Remove lots of AcceleratedWidget code

In the non-remote-CALayer model, we render to an IOSurface and pass it
to the browser process, where we draw that into a CAOpenGLLayer. Delete
all of the code to do that, and just set the contents of a CALayer to
be that IOSurface.

While we're in the neighborhood, change the software path to render into
an IOSurface, and use that same path to draw it. Double-buffer the
software output surface in SoftwareOutputDeviceMac, to avoid writing the
next frame with the CPU while the WindowServer is drawing it (it appears
that the WindowServer does not respect the IOSurface locks).

BUG=546691

Review URL: https://codereview.chromium.org/1420533005

Cr-Commit-Position: refs/heads/master@{#356129}

1 files changed, 3 insertions, 1 deletions

diff --git a/content/common/gpu/image_transport_surface_iosurface_mac.cc b/content/common/gpu/image_transport_surface_iosurface_mac.cc
index 42e8300..1008a5b 100644
--- a/content/common/gpu/image_transport_surface_iosurface_mac.cc
+++ b/content/common/gpu/image_transport_surface_iosurface_mac.cc
@@ -12,7 +12,7 @@ namespace {
 
 // IOSurface dimensions will be rounded up to a multiple of this value in order
 // to reduce memory thrashing during resize. This must be a power of 2.
-const uint32 kIOSurfaceDimensionRoundup = 64;
+const uint32 kIOSurfaceDimensionRoundup = 1;
 
 int RoundUpSurfaceDimension(int number) {
   DCHECK(number >= 0);
@@ -59,11 +59,13 @@ bool IOSurfaceStorageProvider::AllocateColorBufferStorage(
     GLuint texture, gfx::Size pixel_size, float scale_factor) {
   // Allocate a new IOSurface, which is the GPU resource that can be
   // shared across processes.
+  unsigned pixel_format = 'BGRA';
   base::ScopedCFTypeRef<CFMutableDictionaryRef> properties;
   properties.reset(CFDictionaryCreateMutable(kCFAllocatorDefault,
                                              0,
                                              &kCFTypeDictionaryKeyCallBacks,
                                              &kCFTypeDictionaryValueCallBacks));
+  AddIntegerValue(properties, kIOSurfacePixelFormat, pixel_format);
   AddIntegerValue(properties,
                   kIOSurfaceWidth,
                   pixel_size.width());