Bug 1355187 - Rename some struct fields so that the Rust/C++ names are the same. r=rhunt

The binding generator just takes the Rust field names and uses that in the
generated C++ structs. So installing the autogenerated bindings is easier if
we make sure the names are the same ahead of time.

MozReview-Commit-ID: 6cuzmtI5Qqw

gfx/webrender_bindings/WebRenderTypes.h

@@ -480,7 +480,7 @@ inline WrByteSlice RangeToByteSlice(mozilla::Range<uint8_t> aRange) {
 }
 
 inline mozilla::Range<uint8_t> ByteSliceToRange(WrByteSlice aWrSlice) {
-  return mozilla::Range<uint8_t>(aWrSlice.mBuffer, aWrSlice.mLength);
+  return mozilla::Range<uint8_t>(aWrSlice.buffer, aWrSlice.len);
 }
 
 struct BuiltDisplayList {

gfx/webrender_bindings/src/bindings.rs

@@ -550,18 +550,18 @@ impl WrImageDescriptor {
 
 #[repr(C)]
 pub struct WrVecU8 {
-    ptr: *mut u8,
+    data: *mut u8,
     length: usize,
     capacity: usize,
 }
 
 impl WrVecU8 {
     fn to_vec(self) -> Vec<u8> {
-        unsafe { Vec::from_raw_parts(self.ptr, self.length, self.capacity) }
+        unsafe { Vec::from_raw_parts(self.data, self.length, self.capacity) }
     }
     fn from_vec(mut v: Vec<u8>) -> WrVecU8 {
         let w = WrVecU8 {
-            ptr: v.as_mut_ptr(),
+            data: v.as_mut_ptr(),
             length: v.len(),
             capacity: v.capacity(),
         };

gfx/webrender_bindings/webrender_ffi.h

@@ -66,8 +66,8 @@ WR_DECL_FFI_2(WrFontKey, uint32_t, uint32_t)
 // view of a buffer of bytes.
 // The canonical gecko equivalent is mozilla::Range<uint8_t>.
 struct WrByteSlice {
-  uint8_t* mBuffer;
-  size_t mLength;
+  uint8_t* buffer;
+  size_t len;
 };
 
 // ----