Mac: Kill lots of AcceleratedWidget code (with fire)

content/common/gpu/image_transport_surface_iosurface_mac.cc

Index: content/common/gpu/image_transport_surface_iosurface_mac.cc
diff --git a/content/common/gpu/image_transport_surface_iosurface_mac.cc b/content/common/gpu/image_transport_surface_iosurface_mac.cc
index 42e8300d333e9b6668e42fde254cfcdcc310b3ff..9c01d4fb2071b4cf2ea538970866cb6cc109abb5 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;

[ccameron, 2015/10/22 06:09:28]

This is needed so that the IOSurface will always be the size of the content that
is intended to be drawn. This code is going to be destroyed in a follow-up CL,
and the regression in memory usage is limited to when people are rapidly
resizing windows on 10.6-10.8.

 
 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.
+  int pixel_format = 'BGRA';
   base::ScopedCFTypeRef<CFMutableDictionaryRef> properties;
   properties.reset(CFDictionaryCreateMutable(kCFAllocatorDefault,
                                              0,
                                              &kCFTypeDictionaryKeyCallBacks,
                                              &kCFTypeDictionaryValueCallBacks));
+  AddIntegerValue(properties, kIOSurfacePixelFormat, pixel_format);

[ccameron, 2015/10/22 06:09:28]

This property is needed for -[CALayer setContents:] to work.

   AddIntegerValue(properties,
                   kIOSurfaceWidth,
                   pixel_size.width());