Add accidently omitted IDL files from last roll (to multivm@358)

third_party/WebCore/html/canvas/WebGLShaderPrecisionFormat.idl

Index: third_party/WebCore/html/canvas/WebGLShaderPrecisionFormat.idl
diff --git a/third_party/WebCore/html/canvas/WebGLShaderPrecisionFormat.idl b/third_party/WebCore/html/canvas/WebGLShaderPrecisionFormat.idl
new file mode 100644
index 0000000000000000000000000000000000000000..7cfb80e6e4297a656b869a4aefb96dbd21ae64d7
--- /dev/null
+++ b/third_party/WebCore/html/canvas/WebGLShaderPrecisionFormat.idl
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2012, Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+module html {
+
+    interface [
+        Conditional=WEBGL,
+    ] WebGLShaderPrecisionFormat {
+        readonly attribute int rangeMin;
+        readonly attribute int rangeMax;
+        readonly attribute int precision;
+    };
+
+}