Switch to use ANGLE's new APIs to query shader variables.

gpu/command_buffer/service/disk_cache_proto.proto

Index: gpu/command_buffer/service/disk_cache_proto.proto
diff --git a/gpu/command_buffer/service/disk_cache_proto.proto b/gpu/command_buffer/service/disk_cache_proto.proto
index 5a55943fba3afb03a1944e86ae0896efe2a8f4b8..ab3bb57a1b64b359726aa1fe7e032963e6c366e6 100644
--- a/gpu/command_buffer/service/disk_cache_proto.proto
+++ b/gpu/command_buffer/service/disk_cache_proto.proto
@@ -1,24 +1,41 @@
 option optimize_for = LITE_RUNTIME;
 
-message ShaderInfoProto {
-  optional int32 type = 1;
-  optional int32 size = 2;
+message ShaderVariableProto {
+  optional uint32 type = 1;
+  optional uint32 precision = 2;
   optional string name = 3;
-  optional string key = 4;
-  optional int32 precision = 5;
-  optional int32 static_use = 6;  
+  optional string mapped_name = 4;
+  optional uint32 array_size = 5;
+  optional bool static_use = 6;
+  repeated ShaderVariableProto fields = 7;
+  optional string struct_name = 8;
+}
+
+message ShaderAttributeProto {
+  optional ShaderVariableProto basic = 1;
+  optional int32 location = 2;
+}
+
+message ShaderUniformProto {
+  optional ShaderVariableProto basic = 1;
+}
+
+message ShaderVaryingProto {
+  optional ShaderVariableProto basic = 1;
+  optional int32 interpolation = 2;
+  optional bool is_invariant = 3;
 }
 
 message ShaderProto {
   optional bytes sha = 1;
-  repeated ShaderInfoProto attribs = 2;
-  repeated ShaderInfoProto uniforms = 3;
-  repeated ShaderInfoProto varyings = 4;
+  repeated ShaderAttributeProto attribs = 2;
+  repeated ShaderUniformProto uniforms = 3;
+  repeated ShaderVaryingProto varyings = 4;
 }
 
 message GpuProgramProto {
   optional bytes sha = 1;
-  optional int32 format = 2;
+  optional uint32 format = 2;
   optional bytes program = 3;
 
   optional ShaderProto vertex_shader = 4;